Hubbry Logo
Orange Line (Bangkok)Orange Line (Bangkok)Main
Open search
Orange Line (Bangkok)
Community hub
Orange Line (Bangkok)
logo
8 pages, 0 posts
0 subscribers
Be the first to start a discussion here.
Be the first to start a discussion here.
Orange Line (Bangkok)
Orange Line (Bangkok)
Orange Line (Bangkok)
View on Wikipedia
from Wikipedia
MRT Orange Line
รถไฟฟ้ามหานคร สายสีส้ม
Min Buri Station
Overview
StatusStructure Complete :
OR13 Thailand Cultural Centre -
OR29 Yaek Rom Klao
Under Construction :
OR02 Bang Khun Non -
OR13 Thailand Cultural Centre
Future :
OR01 Taling Chan -
OR02 Bang Khun Non
OwnerMass Rapid Transit Authority of Thailand
LocaleBangkok, Thailand
Termini
  • OR01 Taling Chan
  • OR29 Yaek Rom Klao
Stations17 (Structure Complete)
11 (Under construction)
1 (future)
Websitehttps://www.mrta-orangelineeast.com/en/home
Service
TypeRapid transit
SystemMRT
Operator(s)Bangkok Expressway and Metro
Depot(s)Phra Ram 9
Rolling stockSiemens
32 three-car trains
History
Commenced9 February 2017; 8 years ago (2017-02-09)
Planned opening2028 :
OR13Thailand Cultural Centre -
OR29 Yaek Rom Klao
[1]July 2030 :
OR02 Bang Khun Non -
OR13 Thailand Cultural Centre
[1]TBA :
OR01 Taling Chan -
OR02 Bang Khun Non
Technical
Line length38.78 km (24.10 mi)
Elevated 8.43 km (5.24 mi)
Underground: 30.35 km (18.86 mi)
Track gauge1,435 mm (4 ft 8+1⁄2 in) standard gauge
Electrification750 V DC third rail
Operating speed80 km/h (50 mph)
Route map

Legend
 Bang Khun Non
 MRT 
 Siriraj
Chao Phraya River
 Sanam Luang
Democracy Monument
 MRT 
 Lan Luang
Yommarat
 SRT 
 Ratchathewi
 BTS 
 Pratunam
Ratchaprarop
 ARL 
 Din Daeng
Pracha Songkhro
 MRL 
 Thailand Cultural Centre
 MRT 
Rama 9 Depot
 MRTA
Wat Phra Ram 9
Ramkhamhaeng 12
 MRL 
 Ramkhamhaeng University
SAT
Ramkhamhaeng 40
Yaek Lam Sali
 MRT 
 Si Burapha
Ban Ma
Sammakorn
Nom Klao
Rat Phatthana
Wat Bang Pheng
Kheha Ram
Min Buri
 MRT 
 Yaek Rom Klao
This diagram:

The MRT Orange Line (Thai: รถไฟฟ้ามหานคร สายสีส้ม) is an under-construction rapid transit line of the Mass Rapid Transit Authority of Thailand (MRTA) in the Bangkok Metropolitan Area, Thailand. When fully completed, the MRT Orange line will be 35.9 km (22.3 mi) long with 29 stations (7 stations will be elevated for 8.9 km (5.5 mi) and 22 will be underground for 27 km (16.8 mi)), including an interchange with the current Thailand Cultural Centre Station of MRT Blue Line).

The MRT Orange Line is divided into two sections: the 22.5 km (14.0 mi) Eastern Section, running from Yaek Rom Klao to Thailand Cultural Centre,[2][3] and the 13.4 km (8.3 mi) Western Section, extending from Thailand Cultural Centre to Bang Khun Non.

Construction of the Eastern Section commenced in June 2017, and civil works were completed 100% as of June 2023.[4] However, delays in awarding contracts for the signaling systems and rolling stock postponed the line’s opening. In December 2024, Bangkok Expressway and Metro Public Company Limited (BEM) signed a contract with Siemens Mobility and its consortium partners to supply rolling stock and signaling systems for both sections of the line. On August 6, 2025 the MRTA announced that the Eastern Section is projected to open to the public in late-2027[5] earlier than the previously announced opening date of 2028.[1]

Construction of the Western Section began in July 2024. As of the end of July 2025, civil construction had progressed to 14.06%.[6] This section is expected to require approximately six years for completion, with an anticipated opening in July 2030.[1]

Route alignment

[edit]

The MRT Orange Line will travel along a mostly east-west axis from Bangkok's eastern suburbs, passing through the city center and Ko Rattanakosin, before serving Thonburi on the west bank of the Chao Phraya River.

The initial phase of the Orange Line will travel along an elevated structure above Ramkhamkhaeng Road from Yaek Rom Klao station, near the Ramkhamhaeng-Suwinthawong Junction in Min Buri District, to Ban Ma Junction in Bang Kapi District for 7.5 km (4.7 mi) before transitioning underground. The line will continue to travel southwest under Ramkhamhaeng Road until its intersection with Rama IX Road, whence it will proceed westward under Rama IX Road before terminating at Thailand Cultural Centre.

Interchanges for this segment will be available to MRT Pink Line at Min Buri, MRT Yellow Line at Yaek Lam Sali, and the MRT Blue Line at Thailand Cultural Centre.

The western section of the MRT Orange Lin will travel west from Thailand Cultural Centre Station via Din Daeng housing estates and Bangkok City Hall 2 to Vibhavadi Rangsit Road, Sam Liam Din Daeng Junction. It will follow Ratchaprarop Road towards Pratunam before following Phetchaburi Road and Lan Luang Road as the alignment approaches Ko Rattanakosin. The line will travel under Ratchadamnoen Avenue to serve Sanam Luang and Banglamphu before crossing the Chao Phraya River near Phra Pinklao Bridge. Once in Thonburi, the line will follow the Bangkok Noi spur line of the SRT commuter train before terminating at Bang Khun Non, located at Charan Sanitwong road, where there will be an interchange with the MRT Blue Line.

In addition to interchanging with the MRT Blue Line, the western segment will also include an interchange to the Airport Rail Link at Ratchaprarop station, the BTS Sukhumvit Line at Ratchathewi Station, the MRT Purple Line at the future Democracy Monument station. A further extension to Taling Chan railway station is envisioned.

History

[edit]

Development

[edit]

The original plan of the MRT Orange Line aimed to serve travel demand between the northwestern area of Thonburi, at Bang Bamru Railway Station in Bang Phlat District, and the east of Bangkok in Bang Kapi District. It was planned to run along Ramkhamhaeng Road and Ratchawithi Road, passing many public places like Hua Mak Stadium, Dusit Zoo and Victory Monument, and provide access to universities including Ramkhamhaeng University, Suan Sunandha and Suan Dusit Rajabhat University and many government offices. In the 1990s proposal for the Orange Line, it indicates a route length of 27.3 kilometers from Bang Kapi to Rat Burana District, while the planned extensions are to Ban Na for 16.4 kilometers and finally to Min Buri District for 10 kilometers.[7]

In 2009, OTP proposed that the original MRT Brown line plan from Bang Kapi District elevated along Ram Khamhaeng Road to the eastern suburbs in Saphan Sung District and Min Buri District, be merged with the Orange Line and updated Bangkok's mass rapid transit master plan accordingly.[8] In July 2011, the section from Bang Khun Non to Taling Chan was finally scrapped in favour of the SRT Light Red Line spur line which duplicates the same route.[9] In 2012, there were further notable changes made to the central and western sections of the Orange Line. The section from Din Daeng District to Bang Bamru was rerouted away from Victory Monument and Ratchawithi road route to further run south to Pratunam and then west along Petchaburi Road and Larn Luang Road. Continuing farther west along Ratchadamnoen Klang Road and Sanam Luang before passing under the Chao Praya river and finally terminating at Bang Khun Non to interchange with the MRT Blue Line extension.

The MRT Orange line Eastern section was originally planned to be tendered by the end of 2013. However, due to protests by residents regarding station footprint and compulsory land acquisition around stations at Pratunam, Ratchaprarop, Pracha Songkhro and Soesim stations the MRTA needed another 12 months to redesign sections of the line.[10] Subsequently, political protests against the Thai government led to the metro transport funding bill lapsing when parliament was dissolved in December 2013. On 9 December 2015, Cabinet finally approved the Orange Line. On 19 April 2016, the Cabinet further approved a budget of 82.9 billion baht for Phase 1 Eastern section to build 17 stations and 22.5 km (14.0 mi) of rail from the Thailand Cultural Centre to Minburi, of which 12.2 km (7.6 mi) will be underground and 9 km (5.6 mi) will be elevated.[11] The consultation was led by MHPM for project implementation services to Chotjinda Consultant for construction supervision and to MAA Consultant, also for project management and construction.[12]

Western section tender delay and litigation

[edit]

On 3 July 2020, the MRTA released the tender for the design and construction of the Western extension.[13] However in late August 2020, the tender submission deadline was subsequently delayed.[14] and the MRTA amended the tender assessment criteria resulting in a lawsuit and an injunction suspending the tender decision.[15] The tender was subsequently cancelled by the MRTA in February 2021 given ongoing litigation by the BTSC.[16] After approval by the Administrative Court given ongoing litigation, a new tender issued in October has a deadline for bids of January 2022.[17]

The Criminal Court - Corruption and Malfeasance Division hearing into the cancelled tender process was conducted in late December 2021 which further delayed the reissued tender timeframe.[18] Subject to court approval, the MRTA planned to review tender bids for a period of 3 months before seeking Cabinet approval for a reissued tender in April or May 2022. The MRTA reissued the new tender on 24 May 2022 with tender packages available for purchase until 10 June.[19] Fourteen different companies purchased the auction envelopes.[20]

The 141 billion baht western extension consists of 86 billion baht for civil works, 14 billion for land appropriation and 31 billion for systems installation, rolling stock and maintenance. The winning bidder was announced by the MRTA on 9 September 2022 with BEM winning the right to build and run the extension over the ITD consortium.[21] However, continued litigation by the BTSC into 2023 has delayed the start of construction.

In November 2024, AECOM has been chosen by CH. Karnchang Plc (CK) is the lead designer for the western section, while Egis is to offer project management and supervision services on a section.[22][23] EPC consultancy services were handled by Dorsch Gruppe and its Asian subsidiary, along with China Railway No. 2 Engineering Group Co., Ltd.[24]

Construction progress

[edit]

Eastern section

[edit]

Construction contracts were signed on 9 February 2017 between the MRTA and CKST Joint Venture consortium.[25] Construction finally started in June 2017 with a 1980 day construction period with a scheduled opening in October 2022.[26]

At the end of the year, 31 December 2017, progress of civil works construction was at 4.66% according to the MRTA.[27] By the end of July 2018, overall construction progress was 13.57%. By 30 September 2018, overall construction had progressed to 18.33%. [28] At the end of March 2019, construction had progressed to 32.12%.[29] At the end of July 2019, civil construction was at 42.27%. [30] At the end of October 2019, construction had progressed to 49.05%.[31]

At the end of January 2020, construction had progressed to 54.93%.[32] By the end of May 2020, construction had progressed to 62.42%. [33] On 5 October 2020, TBM number 2 finished tunneling and reached Ramkhamhaeng 12 station box as part of contract 2.[34] At the end of September 2020, was at 69.82%.[35]

At the end of January 2021, construction had progressed to 76.09%.[36] Construction progress was 81.03% by the end of April 2021.[37] Construction progress was 87.24% by the end of October 2021.[38] By the end of March 2022, construction progress was at 92.69%.[39] By the end of May 2022, construction had progressed to 94.51%.[40] As of March 23 2023, construction had progressed to 99.00%[41]

By the end of June 2023, construction had progressed to 100.00%.[42]

Contract Notes Contractor(s) Kilometre Cost
E1 OR13 Thailand Cultural Centre to OR16 Ramkhamhaeng 12 CKST Joint Venture 6.29 ฿20,633.00 million
E2 OR16 Ramkhamhaeng 12 to OR19 Hua Mak 3.44 ฿21,507.00 million
E3 OR19 Hua Mak to OR22 Klong Ban Ma Italian-Thai Development 4.04 ฿18,570.00 million
E4 OR22 Klong Ban Ma to OR29 Yaek Rom Klao Unique Construction and Engineering 8.8 ฿9,990.00 million
E5 Depot and Park & Ride CKST Joint Venture ฿4,831.24 million
E6 Track and Electrical Unique Construction and Engineering ฿3,690.00 million
Total Budget ฿79,221.24 million

Western section

[edit]

The Phase 2 Western extension of the Orange line will run from Thailand Cultural Centre to Bang Khun Non via Pratunam. The 13.4 km (8.3 mi) western section will run underground with 12 stations.

The Thai Cabinet was expected to approve the 121 billion baht budget for the Western extension in mid 2017 with a tender due for the 2nd half of 2017.[43] However, this decision was delayed until 2018 as Cabinet requested options to be considered for a joint public and private investment proposal.[44] There were further delays into 2019, but the MRTA finalised a joint PPP plan for Cabinet to approve in mid 2019.[45] On 28 January 2020, the Cabinet approved the 142 billion baht extension. It was originally expected to open in February 2026 and serve 439,000 passengers daily.[46][47]

On 3 July 2020, the MRTA released the tender for the design, construction and operation of the Western extension as a Public-Private Partnership project on a 30 year lease.[13] The tender deadline was 23 September 2020 with the successful bidder to be announced in early October 2020. The tender specified a construction period of three and a half years.

There were 10 tenderers that purchased the request for proposal (RFP) form with two major consortiums that submitted final bids:

  • Bangkok Expressway and Metro Public Company Limited (BEM) - operator of the MRT Blue Line and MRT Purple Lines.
  • BSR Consortium, led by Bangkok Mass Transit System Public Company Limited (BTSC), and supported by BTS Group Holdings (BTS Group) and Sino-Thai Engineering and Construction (STECON). BTSC is the operator of the MRT Pink Line and MRT Yellow Lines.

However, in late August 2020 the tender submission deadline was subsequently delayed by the MRTA.[14] Thereafter, the MRTA amended the tender assessment criteria resulting in a lawsuit being lodged by the BTSC in the Administrative Court on 17 September 2020 with the Court imposing an injunction suspending the tender decision.[15] The tender was subsequently cancelled by the MRTA in February 2021 due to litigation by the BTSC.[16] After approval by the Administrative Court given ongoing litigation, a new tender issued in October has a deadline for bids of January 2022.[17]

The Criminal Court Corruption and Malfeasance division hearings into the cancelled tender process were conducted from 14 to 24 December 2021 and have delayed the reissued tender timeframe.[48] Subject to court approval, the MRTA planned to review all tender bids for a period of 3 months before seeking final Cabinet approval of the winning bid in April 2022. However, there are also construction budget concerns for the extension as steel prices have increased by 40% since the previous budget was approved.[49] The EIA for the western extension was also updated in December 2021 as Din Daeng station was moved north by 500m, Pracha Songkhro station was moved east by 450m and Yommarat station was redesigned.[citation needed]

The MRTA reissued the new tender auction on 24 May 2022 with tender packages available for purchase until 10 June.[19] The 141 billion baht western extension consists of 86 billion baht for civil works, 14 billion for land appropriation and 31 billion for systems installation, rolling stock and maintenance. The winning bidder was announced by the MRTA on 9 September 2022 with BEM winning the right to build and run the extension over the ITD consortium.[21]

On 18 July 2024, construction contracts were signed at the MRTA office. The Minister of Transport, Suriya Juangroongruangkit, instructed MRTA and BEM, the concession holder, to expedite the track and electrical works on the Orange Line's eastern section from the Thailand Cultural Centre to Yaek Rom Klao for completion as soon as possible. The primary objective is to open the eastern section by early 2028, with the western section set to be completed ahead of schedule by November 2028. It was confirmed that the Orange Line’s maximum fare will be capped at 20 Baht or with a flat rate of 20 Baht for the entire route.[50]

Contract Notes Contractor(s) Kilometre
(km) 		Progress
(June 2025) 		Cost
1 OR02 Bang Khun Non to OR13 Thailand Cultural Centre CH. Karnchang Public Company limited 13.1 11.87% ฿82,501.869 million
2 M&E Works and Rolling Stocks 5.61% ฿26,714.000 million
Total Budget 11.15%[citation needed] ฿109,215.869 million

Discovery of human remains at Siriraj Station site

[edit]

On March 18, 2025, archaeologists made a remarkable discovery during an excavation at the construction site of Siriraj Station. Over 70 human skeletons were unearthed beneath the Arun Amarin Bridge, opposite Wat Amarin, along with a large ceramic jar containing cremated bone fragments. This discovery, made as part of a mandated archaeological survey by the Fine Arts Department prior to the Siriraj hospital expansion, has drawn significant attention from historians and researchers.

The burials show unique and previously unrecorded characteristics in Thai archaeology: bodies were laid in an extended position with slightly bent legs, heads oriented westward, and faces tilted southward. Some of the remains were found in alarming postures with hands and feet bound behind their backs, suggesting possible mass execution.

Preliminary assessments date the remains to approximately 200–500 years ago, potentially linking them to the Thonburi period. Experts speculate that this site may be tied to mass executions during the turbulent years before the establishment of Bangkok as the capital in 1782. However, further bone dating and DNA testing are required to confirm the period and possible links to pre-Rattanakosin communities.

The site itself lies within a historically significant area once part of Wang Lang Palace , built around 200 years ago, and may overlap with an ancient settlement dating back 2,000–3,000 years. The discovery of numerous cremation jars alongside the skeletons suggests complex and varied mortuary practices, indicating cultural and ritual significance.

The Mass Rapid Transit Authority of Thailand has confirmed the site is under continued investigation by the Fine Arts Department. If further research verifies early historical connections, the discovery could significantly reshape the understanding of Thonburi’s and Bangkok’s origins.[51]

Rolling stock

[edit]

The tender for operation of the line and purchase of rolling stock for both the eastern and western sections was issued in May 2022, along with the construction of the western section.[52] However, it was delayed due to the ongoing litigation regarding the western extension, and the tender was suspended. In July 2024, it was announced at the signing ceremony of the joint investment contract for the Orange Line that they planned to have 32 electric trains, each with three carriages.[53]

In October 2024, BEM has concluded its selection by choosing Siemens as the manufacturer for the Orange Line trains.[54] The turnkey contract was announced on December 18, 2024. A consortium consisting of Siemens, Bozankaya, and ST Engineering Thailand won a contract from Ch. Karnchang. The contract includes the supply of 32 Siemens three-car trains, with the configuration and design same as the EMU-BLE fleet used on the MRT Blue Line in Bangkok. These trains will be manufactured at the Bozankaya Factory in Ankara, Turkey. Siemens and ST Engineering will supply the bogies, traction, braking, auxiliary systems, and SCADA system for the project, and will be responsible for project management, development, construction, and commissioning. Siemens will also provide service and maintenance for 10 years.[55]

Stations

[edit]
Further information: List of rapid transit stations in Bangkok
Code Station Name Opened Platform Type Position Park

& Ride

Transfer Notes
English Thai
Taling Chan - Bang Khun Non: 4.54 km (Future)
OR01 Taling Chan ตลิ่งชัน TBA Island Underground - Connecting station to;
•  BTS  (1 km walking distance; future)•  SRT 
• SRT Southern Line 		Appeared on the 2022 Final Reports.[56]
Bang Khun Non - Thailand Cultural Centre: 13.2 km (Under construction)
OR02 Bang Khun Non บางขุนนนท์ November 2030; 5 years' time (2030-11) Island Underground - Connecting station to;
•  MRT 
•  SRT  (future)
OR03 Siriraj ศิริราช Stacked - Connecting station with  SRT  (future) Exit to Siriraj Hospital.
OR04 Sanam Luang สนามหลวง Island - Exit to:
• Sanam Luang
• The Grand Palace
• Khaosan Road
• National Theatre
OR05 Democracy Monument อนุสาวรีย์ประชาธิปไตย Island - Interchange station to  MRT  (under construction) Exit to:
• Mahakan fort
• Rattanakosin Exhibition Hall
• Queen Sirikit Gallery
• Royal Pavilion Mahajetsadabadin
• Wat Saket.
OR06 Lan Luang หลานหลวง Island -
OR07 Yommarat ยมราช Island - Connecting station to  SRT  (future)
OR08 Ratchathewi ราชเทวี Island - Connecting station to  BTS 
OR09 Pratunam ประตูน้ำ Stacked - Exit to:
• Embassy of Indonesia
• Pratunam
• Platinum Fashion Mall.
OR10 Ratchaprarop ราชปรารภ Stacked - Connecting station to
•  ARL 
•  SRT  (future)
• SRT Eastern Line 		Exit to:
• Pratunam Market
• Indra Square
• Baiyoke Tower.
The station site has been moved 300 meters north to replace Rangnam station.[56]
OR11 Din Daeng ดินแดง Island - Exit to Bangkok City Hall 2.
OR12 Pracha Songkhro ประชาสงเคราะห์ Side - Connecting station to  MRL  (future)
Thailand Cultural Centre - Yaek Rom Klao: 21.04 km (Structure Complete)
OR13 Thailand Cultural Centre ศูนย์วัฒนธรรมแห่งประเทศไทย May 2028; 2 years' time (2028-05) Side Underground √ Interchange station to  MRT  Exit to:
• The One Ratchada Market
• Esplanade Ratchada
• The Street Ratchada
• China Cultural Centre
• Thailand Cultural Centre.
OR14 MRTA รฟม. Island - Exit to Royal City Avenue (RCA).
OR15 Wat Phra Ram 9 วัดพระราม 9 Stacked - Connecting station to  MRL  (future) Formerly Pradit Manutham.
OR16 Ramkhamhaeng 12 รามคำแหง 12 Stacked - Exit to The Mall Ramkhamhaeng.
OR17 Ramkhamhaeng University มหาวิทยาลัยรามคำแหง Stacked - Exit to Ramkhamhaeng University.

Formerly Ramkhamhaeng.

OR18 SAT กกท. Island - Exit to:
• Hua Mak Sports Complex (which includes the head office of SAT (Sports Authority of Thailand) , Rajamangala Stadium and Indoor Stadium Huamark)
OR19 Ramkhamhaeng 40 รามคำแหง 40 Island - Formerly Hua Mak and Ramkhamhaeng 34.[57]
OR20 Yaek Lam Sali แยกลำสาลี Island - Connecting station to;
•  MRT 
•  MRT  (future) 		Formerly Lam Sali.
OR21 Si Burapha ศรีบูรพา Island -
OR22 Khlong Ban Ma คลองบ้านม้า Side √
OR23 Sammakorn สัมมากร Side Elevated -
OR24 Nom Klao น้อมเกล้า Side -
OR25 Rat Phatthana ราษฎร์พัฒนา Side -
OR26 Min Phatthana มีนพัฒนา Side -
OR27 Kheha Ramkhamhaeng เคหะรามคำแหง Side -
OR28 Min Buri มีนบุรี Side √ Interchange station with  MRT 
OR29 Yaek Rom Klao แยกร่มเกล้า Side - Formerly Suwinthawong.

Note: In February 2020, the MRTA changed the names of 3 stations OR19, OR20, and OR29.[58]

Route map

[edit]

Incidents

[edit]

On 19 May 2025, a 50-year-old construction worker died after falling into a 19-metre-deep excavation shaft at the Lan Luang Station construction site in Bangkok. His body was recovered on 24 May, following five days of continuous search and recovery operations. The incident prompted an official investigation by the Mass Rapid Transit Authority of Thailand (MRTA) and reignited public concern over occupational safety and regulatory oversight on large-scale infrastructure projects.[59][60][61]

Network map

[edit]

See also

[edit]

References

[edit]
[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Orange Line (Bangkok)

View on Grokipedia
from Grokipedia
The MRT Orange Line is a line under construction in , , as part of the Mass Rapid Transit (MRT) system designed to enhance east-west connectivity across the metropolitan area. Spanning 35.9 kilometers from Bang Khun Non station in the west to Min Buri station in the east, it will feature 28 stations, with the western segment primarily underground and the eastern segment incorporating both underground and elevated sections. The line is divided into two main phases: the western section from Bang Khun Non to Thailand Cultural Centre, covering 13.4 kilometers with 11 underground stations and expected to open in July 2030; and the eastern section from Thailand Cultural Centre to Min Buri (Suwinthawong), extending 22.5 kilometers with 17 stations, anticipated to commence operations by late 2027. Key interchanges include Thailand Cultural Centre with the MRT Blue Line and potential links to the Airport Rail Link, aiming to alleviate chronic traffic congestion in central Bangkok by providing high-capacity urban rail service. Managed by the Mass Rapid Transit Authority of Thailand (MRTA), the project incorporates advanced infrastructure such as IP/MPLS communications networks and systems from international suppliers, reflecting efforts to integrate modern technology for efficient operations upon completion in 2030. progress includes traffic diversions and segment mould production to expedite boring, underscoring the line's role in Bangkok's broader transit expansion to support and reduce reliance on road vehicles.

Route Alignment

Overall Description

The MRT Orange Line constitutes a key east-west corridor in Bangkok's mass transit network, linking suburban areas on the city's periphery through its densely populated center. Originating at Bang Khun Non Station in the west—serving as an interchange with the MRT Blue Line—the route proceeds eastward underground to Thailand Cultural Centre Station, another Blue Line interchange, before continuing to Min Buri Station (also known as Suwinthawong) in the east. This alignment aims to alleviate congestion along major arterial roads like Rama VI Road and Ratchada Road, facilitating connectivity between residential, commercial, and industrial zones. Spanning approximately 35.9 kilometers in total, the line predominantly features underground infrastructure to minimize surface disruption in urban areas, with elevated sections confined to the eastern suburbs for cost efficiency and topographic adaptation. It encompasses 27 stations, of which 21 are underground; the western segment alone includes 11 fully subterranean stations over 13.4 kilometers, while the eastern segment adds 17 stations across 22.5 kilometers, blending 10 underground and 7 elevated stops. Interchanges extend beyond the Blue Line to integrate with lines like the at select points, enhancing network-wide mobility. Designed for high-capacity operations, the Orange Line will accommodate driverless trains reaching speeds up to 80 kilometers per hour, with at all stations to ensure safety and efficiency. Upon completion, it is projected to serve over 500,000 daily passengers, drawing from empirical demand models based on Bangkok's growing and existing transit ridership patterns.

Station Details

The MRT Orange Line will feature 28 stations across its 35.9 km route, divided into 21 underground and 7 elevated stations. The western section spans 13.4 km with 11 underground stations from Bang Khun Non to Cultural Centre. The eastern section covers 22.5 km with 17 stations (10 underground and 7 elevated) from Cultural Centre to Min Buri-Suwinthawong. Key interchange stations include Thailand Cultural Centre, connecting to the MRT Blue Line, and Bang Khun Non, linking to the Blue Line's Bang Sue-Tha Phra extension. The eastern section's stations encompass Thailand Cultural Centre, MRTA, Wat Phra Ram 9 (also known as Wat Phraram Kao), Ramkhamhaeng 12, Ramkhamhaeng University, SAT, and others leading to the Min Buri terminal. Supporting infrastructure includes a depot at the MRTA office on 9 Road and a Park & Ride facility at Khlong Ban Ma station accommodating 1,200 vehicles. All stations are designed for , with provisions for future expansions and integrations with other transit modes.

History

Planning and Initial Development

The Orange Line's planning emerged as part of Thailand's broader efforts to develop a comprehensive mass rapid transit (MRT) network in Bangkok, driven by escalating urban traffic congestion and population growth in the 1990s. The inaugural Mass Rapid Transit Master Plan (MTMP), formulated in 1994, proposed an initial network of 135 km by 2011, incorporating early concepts for east-west connectivity that laid the groundwork for the Orange Line's eastern segment from areas like Bang Kapi toward Min Buri. This plan emphasized elevated structures to minimize costs and disruption in densely populated suburbs, reflecting first-phase priorities for rapid implementation amid limited funding post-Asian financial crisis. Subsequent revisions expanded and refined these proposals. The 2000 Urban Rail Transportation Master Plan (URMAP) outlined a 375 km system over 20 years, integrating the Orange Line precursor routes into a multi-line framework, while the 2004 Bangkok Mass Transit Implementation Plan (BMT) targeted 291 km by 2009, further detailing alignments to link peripheral districts with the city center. A 2006 cabinet update adjusted the network to 365.5 km across 10 lines, prioritizing feasibility amid economic recovery, though the Orange Line remained conceptual without allocated construction timelines. The line's modern configuration solidified in the Bangkok Mass Transit Master Plan (M-Map) of 2010–2029, approved in February 2010, which designated the Orange Line as a 35.9 km heavy rail corridor from Bang Khun Non in the west to Min Buri in the east, featuring 28 stations with underground sections in the central-west to navigate the and dense urban fabric, transitioning to elevated in the east. This iteration, developed under the Mass Rapid Transit Authority of Thailand (MRTA) with input from the (JICA), aimed for a total network of 509 km across 12 lines, emphasizing interchange points with the Blue Line and to enhance system efficiency and projected daily ridership exceeding 500,000. Early development stages post-2010 involved detailed route surveys, environmental impact assessments, and preliminary engineering to balance archaeological sensitivities near historical sites and geotechnical challenges in Bangkok's soft alluvial soils. Alignment decisions favored utility corridors and former rights-of-way to reduce land acquisition costs, estimated at over 100 billion baht for the full project, while public consultations addressed resident concerns over noise and property values in elevated eastern stretches. These efforts underscored causal priorities: alleviating radial congestion on north-south lines by providing circumferential relief, with economic modeling indicating a benefit-cost above 1.5 based on time savings and emission reductions.

Tender Processes and Delays

The tender process for the Orange Line's western section, spanning 35.9 km from Bang Khun Phrom to Tha Prachan and linking to the Cultural Centre, began under a public-private partnership (PPP) model but faced repeated cancellations and legal challenges. The Mass Rapid Transit Authority (MRTA) canceled the initial bidding round, prompting lawsuits from aggrieved parties that halted progress for over two years starting around 2021. These disputes centered on irregularities, with a in 2022 upholding elements of the original process, which stalled subsequent re-tendering efforts. Further complications arose from competing bids, including objections from Bangkok Mass Transit System (BTSC), which argued that revised terms for the 35.9 km section violated Cabinet resolutions on project scope. In response, the MRTA proceeded with a net-cost PPP framework, evaluating bids on revenue guarantees offered to the authority. Bangkok Expressway and Metro Public Company Limited (BEM) emerged as the winner in late 2023, submitting the highest return of 78.29 billion baht over 30 years for design, construction, operation, and maintenance rights. The Supreme Administrative Court endorsed BEM's bid in June 2024, clearing the path for contract finalization despite ongoing litigation. The concession agreement was signed on July 3, 2024, with civil works subcontracted to Ch. Karnchang (CK) for mechanical and electrical systems. These delays, compounded by earlier protests against route alignments dating to 2013, postponed the original 2019 operational target, with western section construction now slated to commence in early 2025 on an initial five stations. Subsidiary tenders for systems integration followed suit, with awards in December 2024 to for communications, , and (valued at approximately S$180 million) and for signaling, , and a 20-year maintenance contract. A separate 4.3 billion baht consulting contract was canceled in September 2024 due to insufficient competition, requiring re-tendering that could add minor delays. Overall, six major contracts totaling 79.2 billion baht were executed by MRTA to advance the line amid these procurement hurdles. The development of the Bangkok Orange Line, particularly its western section from Bang Khun Non to Cultural Centre, encountered significant legal obstacles stemming from disputes over the bidding process. In February 2021, Mass Transit System Company (BTSC), a of BTS Group Holdings, filed a against the Mass Rapid Transit Authority of (MRTA) and several officials, alleging abuse of authority under Sections 157 and 165 of the Thai and violations of the Public Procurement Act by canceling the initial bidding round for the 128-billion-baht project in 2019. BTSC claimed the cancellation lacked legal basis and was intended to favor other bidders, resulting in project delays exceeding two years. Subsequent court proceedings favored the MRTA. In September 2022, the Central Criminal Court for Corruption and Misconduct dismissed BTSC's criminal complaint against seven MRTA officials, ruling that the bidding cancellation complied with procurement laws and did not constitute malfeasance. This was upheld by the Supreme Administrative Court in March 2023, which dismissed BTSC's administrative accusing MRTA of unlawfully altering the (TOR) for the rebidding, affirming the agency's discretionary authority in the process. Further challenges arose after the rebidding award to Bangkok Expressway and Metro Public Company Limited (BEM) in late 2023. BTSC appealed, reiterating claims of irregularities and TOR modifications that disadvantaged their consortium. On June 12, 2024, the Supreme Administrative Court rejected the appeal, endorsing the BEM contract and clearing the path for signing on July 18, 2024, for the 140-billion-baht project expected to complete by 2030. These rulings resolved the primary tender disputes but highlighted ongoing vulnerabilities in Thailand's public infrastructure , where competitor lawsuits have repeatedly stalled megaprojects. In early 2025, activist Srisuwan Janya initiated new legal scrutiny, petitioning against the project's and alleging procedural flaws in route alignments, though no final rulings have been issued as of January 2025. Such challenges underscore persistent community and procedural tensions, though they have not halted construction momentum post-2024 settlements.

Construction Progress

Eastern Section

The Eastern Section of the MRT Orange Line extends 22.6 kilometers from Thailand Cultural Centre station to Min Buri station, featuring 17 elevated stations along Rama IX Road and Ramkhamhaeng Road. of civil works began in June 2017 after the Mass Rapid Transit Authority of Thailand (MRTA) awarded the primary contract, valued at 42.92 billion baht, to a between Public Company Limited and No.10 Engineering Group Co., Ltd. This section aims to alleviate in eastern by connecting key areas including and the Min Buri district. Civil engineering tasks, encompassing viaducts, stations, and depot facilities, achieved 100% completion by the end of June 2023. Subsequent phases focused on electrical and mechanical systems, trackwork, signaling, and integration, which experienced delays from challenges. As of December 2024, ancillary works at several elevated stations, such as platform developments and access improvements, remained partially underway during site inspections. The MRTA has targeted late 2027 for commencement on this section, accelerated from prior estimates of 2028 due to progress in systems contracting. operations are anticipated prior to public opening to verify safety and operational efficiency. This timeline positions the Eastern Section ahead of the Western Section, enabling partial line functionality while full integration awaits underground extensions.

Western Section

The Western Section of the MRT Orange Line extends 13.4 kilometers underground from Bang Khun Non station in the west to Thailand Cultural Centre station in the east, comprising 11 stations and following the original railway alignment while crossing the and passing key areas including , Ratchadamnoen Road, and Ratchaprarop Road. This segment connects western districts to central transit hubs, alleviating congestion in densely populated zones. Construction commenced on July 31, 2024, following the signing of a public-private partnership concession agreement with Bangkok Expressway and Metro Public Company Limited (BEM) on July 18, 2024, after years of delays due to tender disputes and legal challenges. Preparatory works included the demolition of three central Bangkok overpasses starting November 15, 2024, to clear right-of-way, alongside infrastructure relocations and traffic diversions. AECOM was appointed as the project lead designer in November 2024 to oversee engineering and tunneling aspects for the fully underground route. As of mid-2025, civil works and mechanical-electrical installations for Phase 1 stood at 13.17% completion, with land acquisition at 51.01%; the MRTA Board reviewed and acknowledged the implementation plan on , 2025. Initial site activities focused on the first five of the 11 stations, prioritizing utility relocations and foundation preparations amid urban constraints. By 2025, progress remained in early stages, with ongoing tunneling preparations and no major disruptions reported specific to this section, though integration with adjacent infrastructure like the Pink Line interchanges continues. Full operational service for the Western Section is projected for July 2030, aligning with the overall Orange Line timeline, pending steady advancement in tunneling and systems installation. This follows the Eastern Section's anticipated earlier opening, enabling phased rollout to mitigate risks in Bangkok's complex subsurface environment.

Archaeological and Site-Specific Issues

During construction of the MRT Orange Line's western section near Siriraj Hospital in , workers unearthed approximately 70 skeletons in April 2025, interpreted by archaeologists as a possible of execution victims from historical periods, prompting the site to be fenced off for detailed excavation and analysis by experts from the Fine Arts Department. This discovery necessitated pauses in groundwork to prioritize preservation, with ongoing studies aimed at determining the remains' age and context before resuming piling and station foundation work, though the Mass Rapid Transit Authority (MRTA) has not quantified specific delays from this event. In the western segment traversing Bangkok's Old Town area, site planning incorporates measures to mitigate impacts on historical structures, including elevated or adjusted alignments to avoid direct interference with heritage zones, while station designs at locations like Bang Khun Non and Tha Phra are engineered to integrate and exhibit any unearthed artifacts, reflecting consultations with cultural authorities to balance transit needs with preservation. Similar archaeological precautions apply to the eastern section from Cultural Centre to Min Buri, where unspecified finds have been reported but deemed insufficient to derail the projected early 2028 opening, as per MRTA assessments emphasizing phased mitigation during utility relocations and tunneling. Site-specific engineering challenges exacerbate these issues in Bangkok's densely , particularly along the 35.9 km route where low headroom beneath existing overpasses and limited workspaces at stations like Charoen Krung necessitate specialized equipment such as silent pilers to minimize vibrations that could damage adjacent historic or fragile buildings. management poses another constraint, with high piezometric pressures in subsurface sand layers complicating deep excavations for underground segments, requiring advanced systems and diaphragm walls to prevent inflows that could flood sites or destabilize nearby archaeological layers during boring for the 14 planned deep stations. These factors have prompted adjustments, including reinforced secant pile techniques, to ensure structural integrity without compromising protocols.

Technical Specifications

Rolling Stock and Fleet

The MRT Orange Line is planned to operate with a fleet of 32 three-car (EMU) trains supplied by under a comprehensive awarded to a including BEM-JKS on December 18, 2024. These trains are designed for the 35.9 km route spanning both eastern and western sections, with production commencing shortly after the award to support operational readiness targeted for 2028 onward. The trains incorporate a low-energy consumption traction system, modern capabilities, spacious interiors, robust , and advanced passenger information systems to enhance reliability and comfort. Built on standard gauge (1,435 mm), they achieve a maximum operating speed of 80 km/h, enabling a system capacity exceeding 50,000 passengers per hour per direction on the heavy rail transit configuration. The contract also encompasses integration of signaling, communications, and , ensuring seamless fleet performance across the line's mix of underground and elevated sections.

Infrastructure and Technology

The MRT Orange Line features a dual-structure alignment comprising an elevated eastern section and an underground western section, spanning a total length of 35.9 kilometers with 29 stations. The western section from Taling Chan to Cultural Centre measures approximately 13.4 kilometers entirely underground, incorporating 11 stations designed to integrate with existing urban while minimizing surface disruption. The eastern section, extending from Min Buri to Cultural Centre, primarily adopts an elevated configuration to traverse densely populated areas efficiently. Track infrastructure employs a standard gauge of 1,435 mm, consistent with other MRT lines in for and . is provided via a third-rail system at 750 V DC, enabling efficient energy distribution for both elevated and subterranean segments. Signaling and train control systems incorporate advanced integration managed by , including (CBTC) elements for automated operation and safety enhancements. Additionally, supplies supervisory control and data acquisition () systems, along with automated (AGIL PSD) at all stations to improve passenger safety and climate control in underground environments. The line's maintenance depot is situated at Rama 9, east of Thailand Cultural Centre, with expansions to accommodate Orange Line operations alongside shared facilities from the Blue Line. Station designs emphasize accessibility, with provisions for escalators, elevators, and integration points to the and at key interchanges like Thailand Cultural Centre. Construction incorporates viaducts for elevated portions and cut-and-cover or tunnel boring methods for underground tunnels, addressing Bangkok's challenging soil conditions and high groundwater levels. ![Min Buri Station (Orange Line)](./assets/Min_Buri_Station_(Orange_line)

Challenges and Controversies

Bidding Irregularities and Corruption Allegations

The bidding process for the western section of the Orange Line, spanning 13.4 km from Bang Khun Non to Min Buri with 11 stations, faced multiple allegations of irregularities starting with the first tender in July 2020, which was canceled due to insufficient credible bids from participants including Mass Transit System Plc (BTSC). In the subsequent round launched in May 2022, BTSC accused the Mass Rapid Transit Authority (MRTA) of altering the (TOR) post-envelope sale by adding a 30% technical score weighting, allegedly to favor higher-cost bidders and exclude competitors like Sino-Thai Engineering Plc, an ally of BTSC. These changes, affecting only 3 of 100 reference scores, were defended by MRTA as necessary for complex subway and providing all bidders, including BTSC, 45 days to adapt proposals. BTSC executives, including chairman Keeree Kanjanapas, publicly claimed the process was "rife with " on December 9, 2022, citing graft escalation and potential losses of approximately 68 billion baht, as BTSC's bid required a 9.67 billion baht compared to the winning 78.28 billion baht demand from Bangkok Expressway and Metro Plc (BEM). The Organization of Thailand (ACT) and a House sub-committee echoed calls for probes into unfair competition, while a targeted then-Prime Minister and Transport Minister Saksayam Chidchob for alleged bidding collusion and dereliction. MRTA rejected all accusations on December 11, 2022, emphasizing transparency through an "integrity pact" with ACT and oversight by five independent observers, in compliance with the Public-Private Partnership Act. The Department of Special Investigation (DSI) raised further concerns on December 26, 2023, suspecting illegality in bidder qualification screening for the Bang Khun Non–Min Buri tenders submitted July 27, 2022, particularly Italian-Thai Development (ITD) Group's eligibility despite a jailed authorized director violating Public-Private Partnership Committee rules; MRTA countered that self-certification sufficed without formal screening. Legal challenges culminated in rulings favoring MRTA: the Central Administrative Court upheld the process on August 8, 2022, and the Supreme Administrative Court affirmed on March 1, 2023, finding no abuse of authority in TOR adjustments or favoritism. A final suit dismissal on June 13, 2024, cleared BEM's contract, though DSI suspicions briefly halted progress pending review. These disputes, spanning over four years, contributed to delays without substantiated findings of by judicial bodies.

Environmental and Community Impacts

The construction of the Orange Line has involved measures to mitigate environmental effects, including the deployment of water spray systems and daily road cleaning with vacuum trucks by contractors to suppress dust emissions, particularly along the Thailand Cultural Centre to Min Buri section. These actions address elevated PM2.5 levels linked to site activities, with the Mass Rapid Transit Authority (MRTA) enhancing controls amid broader Bangkok efforts to curb pollution from infrastructure projects. Vibration and noise from piling operations have been reduced through the use of silent pilers in constrained urban spaces, minimizing structural risks to adjacent buildings. Environmental Impact Assessments (EIAs) for both eastern and western sections outline prevention and corrective measures, though compliance reports indicate ongoing monitoring for air quality and waste management. Community disruptions have been significant, especially in the western extension from Taling Chan to Bang Khun Si, where land acquisition affects approximately 800 plots and 400 houses, primarily in Ratchadaphisek, Din Daeng, and Prachasongkhroh areas, prompting resident protests and demands for fair compensation. Construction-related , including flyover closures, has exacerbated air quality issues, contributing to over 100 closures in January 2025 due to hazardous PM2.5 levels. Legal challenges, such as activist Srisuwan Janya's January 2025 court petition for an injunction against the western extension citing EIA inadequacies, highlight tensions over unaddressed community and environmental risks. Proximity to stations has driven up prices, with studies showing elevated costs near Orange Line stops from 2004–2015, pricing out lower-income residents and fostering patterns observed in Bangkok's transit corridors. In the long term, the line's projected ridership is anticipated to lower by displacing private vehicle use, aligning with broader MRT system benefits in reducing urban carbon footprints through modal shifts.

Cost Management and Overruns

The MRT Orange Line project, encompassing both eastern and western sections, has an estimated total budget exceeding 140 billion baht, with financing structured through public-private partnerships (PPPs) to allocate risks and control expenditures. The eastern section's civil works were budgeted at 79,221.24 million baht, divided across six contracts awarded to consortia including CH. Karnchang-Sino Thai Engineering and Construction (CKST) joint venture for multiple segments totaling over 47 billion baht, (ITD) for 18.57 billion baht, and Unique Construction and Engineering for segments worth 13.68 billion baht combined. The bears responsibility for civil works costs in the eastern section, while land acquisition is funded separately from the national budget. Cost management relies on the PPP framework, particularly for the western section, where private operators like Bangkok Expressway and Metro (BEM) and CH. Karnchang (CK) assume responsibility for civil works , operations, and maintenance to mitigate overruns. Under this model, CK committed to handling civil works for the western extension, addressing risks from delays and potential escalations, with BEM securing a concession agreement on , 2024, for a project value of approximately 109 billion baht in connected transactions. The provides subsidies, including 96 billion baht for western section , supplemented by private debt financing estimated at 120 billion baht overall, aiming to align incentives for efficiency. Despite legal disputes delaying the western section's bidding process by over two years until resolution in , no significant cost overruns have been publicly reported for completed phases, with eastern civil works achieving 100% completion by June 2023 ahead of some timelines. Identified risks include material price fluctuations, such as cost increases, and construction uncertainties, but contractual provisions place overrun liabilities primarily on private partners to enforce fiscal discipline. Early estimates from 2015 pegged civil works at 85.5 billion baht excluding land acquisition, reflecting upward adjustments over time due to scope expansions rather than inefficiencies.

Incidents and Safety Concerns

Major Incidents During Construction

On May 19, 2025, a 33-year-old identified as Sarawut Chanthason fell into a 19-meter-deep, water-filled excavation pit at the Lan Luang Station site of the MRT Orange Line extension in Bangkok's Pom Prap Sattru Phai district. The incident occurred during the dismantling of old foundation piles, when the surface soil gave way beneath him, triggering a partial that buried the pit with mud and debris. Rescue operations, involving drilling equipment and pumps to remove water and soil, began immediately but were hampered by unstable ground conditions and the depth of the collapse. Sarawut was declared dead on May 20, 2025, after medical teams confirmed no during the ongoing extraction efforts, though his body was not recovered until May 24 due to the challenging terrain and safety risks to rescuers. The Mass Rapid Transit Authority (MRTA) stated that preliminary investigations pointed to inadequate securing of the excavation edge as a contributing factor, prompting a temporary halt in work at the site for safety audits. No other workers were injured in the incident, but it highlighted ongoing safety vulnerabilities in deep foundation work amid Bangkok's soft soil and high levels. This fatality marked one of the most severe construction-related deaths on the Orange Line project to date, underscoring persistent challenges in enforcing safety protocols despite MRTA-mandated guidelines for and monitoring. Authorities initiated a formal into compliance with occupational safety standards, with the contractor facing potential penalties under Thailand's Labour Protection Act.

Network Integration and Future Plans

Connections to Existing Systems

The Orange Line will integrate with Bangkok's existing network through several planned interchange stations, facilitating transfers primarily to the MRT Blue Line and the Airport Rail Link (ARL). These connections aim to enhance east-west connectivity across the city, linking the western suburbs to central districts and eastern outskirts while complementing the north-south orientation of the Blue and Purple Lines. Key interchanges include Bang Khun Non Station at the western terminus, where passengers can transfer to the MRT Blue Line's Bang Sue-Tha Phra section, enabling access to northern and southern routes. In the central segment, Thailand Cultural Centre Station provides a direct link to the Blue Line, serving as the junction between the Orange Line's west and east sections and supporting high-volume transfers near commercial areas. Phra Ram 9 Station further connects to the Blue Line, offering proximity to business districts and the MRTA headquarters. Additionally, Ratchaprarop Station in the western segment will allow transfers to the ARL, improving access to for eastern-bound travelers.
StationConnected SystemType of Connection
Bang Khun NonMRT Blue LineUnderground interchange, western terminus
Thailand Cultural CentreMRT Blue LineUnderground interchange, line junction
Phra Ram 9MRT Blue LineUnderground interchange
RatchapraropAirport Rail LinkPlanned elevated/underground transfer
No direct interchanges with the are planned, though the Orange Line's alignment near stations may support feeder bus or walking transfers in the future. Overall, these links are expected to reduce reliance on road transport and boost ridership upon the line's phased openings, with the east section targeted for 2027 and the west for 2028.

Extensions and Long-Term Development

The Orange Line is being developed in two primary sections to form a continuous route from Bang Khun Non in the west to Min Buri in the east, totaling approximately 36 km with 28 stations. The eastern section, extending 22.6 km from Thailand Cultural Centre station to Min Buri with 17 stations (10 underground and 7 elevated), is under construction as part of the initial phase approved in the Bangkok Metropolitan Area Railway Development Plan. Construction progress as of mid-2025 supports an opening for public service in late 2027, ahead of earlier projections, with full integration into the MRT network to improve east-side connectivity to central Bangkok. The western section, a 13.4 km underground alignment from Bang Khun Non to Thailand Cultural Centre featuring 11 stations, received cabinet approval on January 28, 2020, under a public-private partnership with Bangkok Expressway and Metro Public Company Limited (BEM). Construction commenced on July 31, 2024, following a concession agreement signed on July 18, 2024, with civil works and mechanical-electrical systems at 13.17% completion as of the latest official update; operations are slated for July 2030, including a depot at the MRTA office on Rama 9 Road. This section will facilitate interchanges with the MRT Blue Line and SRT Red Line at Bang Khun Non, crossing under the Chao Phraya River and key roads like Ratchadamnoen and Phetchaburi. Long-term development emphasizes completion of these sections by 2030 to achieve a unified heavy rail system with a maximum capacity of 50,000 passengers per hour per direction, aligning with the Mass Rapid Transit Master Plan (M-Map) for Bangkok's 509 km network across 12 routes approved in 2010. While no immediate further extensions beyond Min Buri or Bang Khun Non are confirmed in current MRTA plans, the line's design supports potential future links to western suburbs like Taling Chan, contingent on updated master plan revisions and funding, to address chronic traffic congestion and boost ridership forecasted at over 439,000 daily trips. Ongoing procurements, such as 51 trains for the western section and Nokia's IP/MPLS network for the full 35.9 km route, underscore commitments to reliable operations through 2030 and beyond via long-term maintenance agreements.

References

  1. https://www.mrta.co.th/en/the-orange-line-Bang%20Khun%20Non
  2. https://www.mrta.co.th/en/the-mrt-orange-line-min-buri-suwinthawong
  3. https://www.unicrane.net/en/modules/news/article.php?storyid=278
  4. https://www.khaosodenglish.com/featured/2024/07/22/new-orange-line-where-are-the-28-stations-connecting-east-and-west-bangkok/
  5. https://thailand.locality.guide/2025/06/25/orange-line-to-open-by-late-2027-mrt-races-to-finalize-southern-purple-line-operations/
  6. https://www.mrta.co.th/en/
  7. https://www.railway-technology.com/news/nokia-bangkok-mrt-orange-line/
  8. https://www.kone.com/en/news-and-insights/releases/kone-to-equip-bangkok-metro-s-orange-line-in-thailand-2020-10-09-2.aspx
  9. https://www.mrta.co.th/en/news-release/21262
  10. https://www.mrta.co.th/en/the-orange-line-Bang%2520Khun%2520Non
  11. https://mrta-orangelineeast.com/en/route
  12. https://www.mobility.siemens.com/global/en/portfolio/references/bangkok-orange-line.html
  13. https://www.railway.supply/bangkok-new-orange-metro-line-to-begin-operation-in-2028-investments-timelines-and-expected-passenger-flow/
  14. https://mrta.devfunction.com/en/the-orange-line
  15. https://www.mrta-orangelineeast.com/en/home_progress
  16. https://www.mrta-orangelineeast.com/en/route
  17. https://www.mdpi.com/2071-1050/14/1/284
  18. https://www.jttri-airo.org/en/dll.php?id=32&s=pdf1&t=repo
  19. https://www.railway-technology.com/projects/the-orange-line-bangkok/
  20. https://www.unescap.org/sites/default/files/8.2%2520Mass%2520Rapid%2520Transport%2520Systems%2520Development%2520through%2520Private%2520Sector%2520Involvement%2520-%2520Experience%2520from%2520Thailand.pdf
  21. https://www.bangkokpost.com/thailand/general/2521705/legal-disputes-may-delay-orange-line-warns-mrta
  22. https://www.partnershipsbulletin.com/article/1796928/thailands-orange-line-falters-again
  23. https://www.nationthailand.com/tags/Bidding
  24. https://www.nationthailand.com/business/corporate/40038761
  25. https://bem.listedcompany.com/misc/mdna/20250227-bem-mdna-fy2024-en.pdf
  26. https://investor.bemplc.co.th/storage/download/information-memorandum/20240329-bem-information-memorandum-en.pdf
  27. https://www.nationthailand.com/news/general/40042902
  28. https://www.businesstimes.com.sg/companies-markets/st-engineering-wins-s180-million-contracts-bangkok-rail-project
  29. https://press.siemens.com/global/en/pressrelease/siemens-mobility-and-consortium-partners-secure-important-rail-contracts-thailand
  30. https://www.facebook.com/thaitrainguide/posts/consulting-contract-for-orange-line-project-cancelled-due-to-lack-of-competition/515699461208660/
  31. https://www.railjournal.com/passenger/metros/mrta-awards-bangkok-orange-line-contracts/
  32. https://huahintoday.com/sports/mrta-getting-sued-by-btsc-for-scrapping-orange-line-bidding/
  33. https://www.nationthailand.com/business/corporate/40020463
  34. https://www.nationthailand.com/business/corporate/40025326
  35. https://www.bangkokpost.com/thailand/general/2518206/court-agrees-to-dismiss-orange-line-suit
  36. https://thethaiger.com/news/national/mrt-wins-legal-battle-to-extend-orange-line
  37. https://thailand-construction.com/legal-disputes-may-delay-bangkoks-orange-line-warns-mrta/
  38. https://thai.news/news/thailand/bangkoks-orange-line-extension-controversy-srisuwan-janya-challenges-environmental-impact-and-project-legitimacy
  39. https://www.bangkokpost.com/thailand/general/2832487/orange-line-due-to-fully-open-in-2030
  40. https://www.nationthailand.com/news/general/40043143
  41. https://aecom.com/press-releases/aecom-to-serve-as-project-lead-designer-for-bangkoks-mrt-orange-line-west-project/
  42. https://thai.news/news/thailand/unveiling-sirirajs-grim-past-70-skeletons-found-during-mrt-orange-line-construction
  43. https://www.the-sun.com/news/13946326/mass-grave-thailand-bangkok-station/
  44. https://www.thaienquirer.com/56603/mrta-confident-eastern-orange-line-opens-by-early-2028-despite-archaeological-finds/
  45. https://www.bangkokpost.com/thailand/general/2894797/orange-line-construction-disruptions-expected
  46. https://www.press-in.org/_upload/files/Newsletters/Director%2520Research/Director%2520Research_Pastsakorn%2520Kitiyodom.pdf
  47. https://onlinelibrary.wiley.com/doi/pdf/10.1002/geot.202300013
  48. https://www.researchgate.net/publication/371542141_Challenges_in_design_and_construction_of_Bangkok_MRT_Orange_Line_project
  49. https://www.railwaygazette.com/urban-rail/thai-metro-rolling-stock-and-signalling-contracts-let/68189.article
  50. https://www.railjournal.com/fleet/siemens-wins-bangkok-metro-train-and-thai-mainline-contracts/
  51. https://mrta-orangelineeast.com/en/train
  52. https://www.railway-technology.com/news/siemens-trains-thailand-projects/
  53. https://www.railway-technology.com/news/aecom-mrt-orange-line-west-project/
  54. https://www.pdmo.go.th/pdmomedia/documents/2020/Aug/Project%2520Emerald%25202020%2520-%2520Information%2520Memorandum%2520%28EN%29%282000544055.pdf
  55. https://www.urbanrail.net/as/bang/bangkok.htm
  56. https://www.railwaygazette.com/urban-rail/orange-line-heads-for-bangkok-centre/66983.article
  57. https://www.stengg.com/en/newsroom/news-releases/st-engineering-bring-advanced-metro-technologies-to-bangkok-mrt/
  58. https://www.nationthailand.com/thailand/general/40022975
  59. https://www.bangkokpost.com/opinion/opinion/2410795/probe-train-bid-claims
  60. https://thailand-construction.com/thailands-top-court-rules-in-favour-of-mrt-authority-in-lawsuit-over-mrta-orange-line-bidding/
  61. https://www.nationthailand.com/thailand/general/40034152
  62. https://www.mrta.co.th/en/news-release/10173
  63. https://thainews.prd.go.th/nbtworld/news/view/872911/?bid=1
  64. https://www.taylorfrancis.com/chapters/edit/10.1201/9781003215226-56/silent-piler-bangkok-mrt-orange-line-project-kitiyodom-boonsiri
  65. https://www.mrta.co.th/en/environmental-operations/1517
  66. https://thai.news/news/thailand/mrtas-western-orange-line-expansion-impact-on-din-daeng-residents-and-legal-challenges
  67. https://www.pattayamail.com/thailandnews/bangkok-western-route-of-orange-line-railway-system-land-surveying-set-to-begin-in-october-469098
  68. https://en.vietnamplus.vn/thailand-over-100-schools-close-over-air-pollution-post308850.vnp
  69. https://www.bangkokpost.com/thailand/general/2936412/activist-challenges-orange-line-environmental-report
  70. https://www.researchgate.net/publication/388840561_Determinants_of_New_Condominium_Prices_near_MRT_Orange_Line_Stations_Case_study_of_Estimating_Housing_Affordability_in_Bangkok_Thailand
  71. https://www.railwaynews.net/bangkok-orange-line-mrt-project-overview-construction-and-impact.html
  72. https://www.researchgate.net/publication/351977368_Measuring_Emission_Reduction_Impacts_of_Mass_Rapid_Transit_in_Bangkok_The_Effect_of_A_Full_Network_MEASURING_EMISSION_REDUCTION_IMPACTS_OF_MASS_RAPID_TRANSIT_IN_BANGKOK_THE_EFFECT_OF_A_FULL_NETWORK
  73. https://thainews.prd.go.th/nbtworld/news/view/459223/?bid=1
  74. https://www.bangkokpost.com/thailand/pr/2838996/bem-advances-orange-line-construction-with-ck-partnership
  75. https://mrta-orangelineeast.com/en/invest
  76. https://bem.listedcompany.com/misc/mdna/20240813-bem-mdna-2q2024-en.pdf
  77. https://www.railjournal.com/passenger/metros/mrta-launches-tender-for-us-2-8bn-orange-line-metro-contract/
  78. https://www.kaohooninternational.com/markets/566505
  79. https://www.railwaygazette.com/bangkok-orange-line-approved/41763.article
  80. https://world.thaipbs.or.th/detail/mans-body-recovered-six-days-after-falling-into-sinkhole-at-mrt-construction-site-/57619
  81. https://www.nationthailand.com/news/general/40050416
  82. https://www.bangkokpost.com/thailand/general/3030030/buried-construction-worker-declared-dead-search-for-body-continues
  83. https://thethaiger.com/news/national/landslide-at-bangkok-mrt-construction-site-leaves-1-worker-missing
  84. https://www.oananews.org/index.php/node/698696
  85. https://www.thestar.com.my/aseanplus/aseanplus-news/2025/05/25/worker-found-dead-after-falling-into-pit-at-bangkok039s-orange-line-construction-site
  86. https://www.thailandwithmonchai.com/blogs/bangkok-mrt-pink-and-orange-lines-2025-complete-guide-to-fares-stations-and-bts-connections
  87. https://mrta-orangelineeast.com/en/structure
  88. https://www.facebook.com/wanderlustwelshman/posts/-update-mrt-orange-line-project-in-thailand-mrt-orange-line-east-project-thailan/566728802770139/
  89. https://www.facebook.com/groups/898899773959040/posts/2274631433052527/
  90. https://www.bangkokpost.com/thailand/general/2830457/cabinet-approves-bangkoks-orange-line-route
  91. https://www.jttri.or.jp/docs/workshop250117-17.pdf
  92. https://globalmasstransit.net/bem-signs-agreement-for-bangkok-mrt-orange-line-western-section-to-procure-51-trains-thailand/
Add your contribution
Related Hubs
User Avatar
No comments yet.