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SRT Light Red Line
The SRT Light Red Line, or Nakhon Withi Line (Thai: รถไฟชานเมือง สายนครวิถี) is a 15 km (9.3 mi) between Krung Thep Aphiwat Central Terminal and Taling Chan and is part of the SRT Red Lines suburban railway system serving the greater Bangkok Metropolitan Region. The construction plan is split into 5 phases.
Phase I running between Krung Thep Aphiwat Central Terminal and Taling Chan opened for trial operations on 2 August 2021 with full commercial services commencing on 29 November 2021. An initial segment from Taling Chan to Bang Son previously opened for limited, free trial service between 5 December 2012 and 13 January 2014 with only 12 services a day until all services were fully suspended due to the lack of rolling stock.
Extensions for Phase II running from Taling Chan to Salaya and Phase III spur line from Taling Chan to Siriraj were approved by the Thai Cabinet on 17 June 2025. In addition, three infill stations of Rama VI Bridge, Bang Kruai (EGAT) and Ban Chim Phli were approved under a single construction contract totalling 20.5km. The proposal had been submitted to the Cabinet secretariat on 27 March 2025 and expects to open bidding in late-2025. The approved budget decreased from 16.847 to 15.176 billion baht, with construction projected to run from January 2026 to December 2028 and services beginning in 2029.
As of June 2025, there are no updates for Phase IV and Phase V of the project. When fully completed, the line will run east–west from Salaya, Thailand in Phutthamonthon District of Nakhon Pathom Province to Hua Mak railway station in Bangkok.
The 15 km (9.3 mi) section runs from Krung Thep Aphiwat Central Terminal (the new Intercity Terminal in Chatuchak District) to Bang Son where it interchanges with the MRT Purple Line. It then continues west and crosses the Chao Phraya River to the Thonburi side of Bangkok before continuing farther west to Taling Chan where it terminates. Krung Thep Aphiwat Central Terminal Intercity Terminal provides interchange with the SRT Dark Red Line and MRT Blue Line. The line will be extended 14.8 km (9.2 mi) west to Sala Ya in Phutthamonthon District of Nakhon Pathom Province. Finally, the line will be extended south from Krung Thep Aphiwat Central Terminal via Phaya Thai and then east to Hua Mak Railway Station in the east of Bangkok where it will interchange with the MRT Yellow Line.
In 2004, in conjunction with OTP, the SRT began formulating plans for a new, modern suburban network in Bangkok along existing SRT alignments to replace the existing, limited services. On 7 November 2006, the Thai Cabinet passed a resolution to approve the framework of the new network with the SRT Light Red line being DMU operations while the SRT Dark Red Light would be EMU. The Cabinet approved the line on 22 May 2007 with a budget of 13.133 billion baht. At the time, it was expected that the full iine could be completed within 15–20 years. Contracts for construction of the initial section from Taling Chan to Bang Sue were awarded by the SRT on 29 September 2009. The contract was signed on 15 December 2008, with the contract awarded to the Unique-Chun Wo consortium.
Construction started in early 2010 after some site access delays related to slum dwellers who had been residing various sections of SRT land for many years. Works progressed well but were thereafter delayed for a few months due to the late 2011 floods in Bangkok with floodwaters inundated on parts of the route. Construction was completed by the 3rd quarter of 2012. Testing began in September 2012 for a 3-month period.
The line opened for free limited trial service on 5 December 2012 between Taling Chan Station and Bang Son Station. The line was operated with 2 refurbished DMUs running a very limited service. There were only 6 services each way a day every 60 minutes from 6am to 8am and from 4pm to 7pm. As such, only a few hundred passengers a day rode the service. On 14 September 2013, weekend services were cancelled. Effective 13 January 2014, all services were suspended until electrification works could be completed and rolling stock procured which was expected to be by the end of 2018.
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SRT Light Red Line
The SRT Light Red Line, or Nakhon Withi Line (Thai: รถไฟชานเมือง สายนครวิถี) is a 15 km (9.3 mi) between Krung Thep Aphiwat Central Terminal and Taling Chan and is part of the SRT Red Lines suburban railway system serving the greater Bangkok Metropolitan Region. The construction plan is split into 5 phases.
Phase I running between Krung Thep Aphiwat Central Terminal and Taling Chan opened for trial operations on 2 August 2021 with full commercial services commencing on 29 November 2021. An initial segment from Taling Chan to Bang Son previously opened for limited, free trial service between 5 December 2012 and 13 January 2014 with only 12 services a day until all services were fully suspended due to the lack of rolling stock.
Extensions for Phase II running from Taling Chan to Salaya and Phase III spur line from Taling Chan to Siriraj were approved by the Thai Cabinet on 17 June 2025. In addition, three infill stations of Rama VI Bridge, Bang Kruai (EGAT) and Ban Chim Phli were approved under a single construction contract totalling 20.5km. The proposal had been submitted to the Cabinet secretariat on 27 March 2025 and expects to open bidding in late-2025. The approved budget decreased from 16.847 to 15.176 billion baht, with construction projected to run from January 2026 to December 2028 and services beginning in 2029.
As of June 2025, there are no updates for Phase IV and Phase V of the project. When fully completed, the line will run east–west from Salaya, Thailand in Phutthamonthon District of Nakhon Pathom Province to Hua Mak railway station in Bangkok.
The 15 km (9.3 mi) section runs from Krung Thep Aphiwat Central Terminal (the new Intercity Terminal in Chatuchak District) to Bang Son where it interchanges with the MRT Purple Line. It then continues west and crosses the Chao Phraya River to the Thonburi side of Bangkok before continuing farther west to Taling Chan where it terminates. Krung Thep Aphiwat Central Terminal Intercity Terminal provides interchange with the SRT Dark Red Line and MRT Blue Line. The line will be extended 14.8 km (9.2 mi) west to Sala Ya in Phutthamonthon District of Nakhon Pathom Province. Finally, the line will be extended south from Krung Thep Aphiwat Central Terminal via Phaya Thai and then east to Hua Mak Railway Station in the east of Bangkok where it will interchange with the MRT Yellow Line.
In 2004, in conjunction with OTP, the SRT began formulating plans for a new, modern suburban network in Bangkok along existing SRT alignments to replace the existing, limited services. On 7 November 2006, the Thai Cabinet passed a resolution to approve the framework of the new network with the SRT Light Red line being DMU operations while the SRT Dark Red Light would be EMU. The Cabinet approved the line on 22 May 2007 with a budget of 13.133 billion baht. At the time, it was expected that the full iine could be completed within 15–20 years. Contracts for construction of the initial section from Taling Chan to Bang Sue were awarded by the SRT on 29 September 2009. The contract was signed on 15 December 2008, with the contract awarded to the Unique-Chun Wo consortium.
Construction started in early 2010 after some site access delays related to slum dwellers who had been residing various sections of SRT land for many years. Works progressed well but were thereafter delayed for a few months due to the late 2011 floods in Bangkok with floodwaters inundated on parts of the route. Construction was completed by the 3rd quarter of 2012. Testing began in September 2012 for a 3-month period.
The line opened for free limited trial service on 5 December 2012 between Taling Chan Station and Bang Son Station. The line was operated with 2 refurbished DMUs running a very limited service. There were only 6 services each way a day every 60 minutes from 6am to 8am and from 4pm to 7pm. As such, only a few hundred passengers a day rode the service. On 14 September 2013, weekend services were cancelled. Effective 13 January 2014, all services were suspended until electrification works could be completed and rolling stock procured which was expected to be by the end of 2018.