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British Rail Class 710
Aventra
London Overground Class 710 at Hackney Downs
The interior of a Class 710 unit
In service23 May 2019 – present
ManufacturerBombardier Transportation
Built atDerby Litchurch Lane Works
Family nameAventra
Replaced
Constructed2017–2020
Number built54
Formation
  • 4 cars per 710/1 and 710/2 unit:
  • DMS-PMS(W)-MS-DMS
  • 5 cars per 710/3 unit:
  • DMS-MS-PMS(W)-MS-DMS
Fleet numbers
  • 710101–710130
  • 710256–710273
  • 710374–710379
Capacity
  • 4-car:
  • 189 seats plus 489 standees
  • 5-car:
  • 241 seats plus 614 standees
OperatorLondon Overground
Depots
Lines served
Specifications
Car body constructionAluminium
Train length
  • 4-car: 82.87 m (271 ft 11 in)
  • 5-car: 102.86 m (337 ft 6 in)
Car length
  • DM vehs.: 21,446 mm (70 ft 4 in)
  • Others: 19,990 mm (65 ft 7 in)
Width2,772 mm (9 ft 1 in)
Height3,760 mm (12 ft 4 in)
Doors
  • Double-leaf sliding plug
  • (2 per side per car)
Maximum speed75 mph (121 km/h)
Weight
  • 710/1: 144 tonnes (142 long tons; 159 short tons)
  • 710/2: 151 tonnes (149 long tons; 166 short tons)
  • 710/3: 182 tonnes (179 long tons; 201 short tons)
Electric systems
Current collection
BogiesBombardier Flexx-Eco
Braking systems
Safety systems
Coupling systemDellner 12
Multiple working
  • Within class (up to 12 cars total)
Track gauge1,435 mm (4 ft 8+1⁄2 in) standard gauge
Notes/references
Sourced from[1] unless otherwise noted.

The British Rail Class 710 Aventra is a class of electric multiple unit passenger trains built by Bombardier Transportation for use on the London Overground network. The trains are part of Bombardier's Aventra family. The contract to provide 45 four-car trains was awarded in July 2015 and the trains were originally due to enter service in May 2018, although introduction was delayed until May 2019.[2]

History

[edit]

Background and specifications

[edit]
Class 710 sitting at Willesden Junction for a test run in April 2019

In 2012, Transport for London announced its intention to procure a fleet of new, longer DMUs, as the Class 172 units then in service were unable to handle the passenger demand, causing overcrowding throughout the day. TfL issued a tender for manufacturers to supply eight three- or four-car trains.[3] However, this proposal was subsequently shelved when the Government announced in June 2013 that the Gospel Oak to Barking line would be electrified,[4] with proposals instead to purchase a fleet of new EMUs.[5]

TfL invited expressions of interest for a total of 39 four-car EMUs in April 2014, with 30 required for the Lea Valley Lines, eight for the Gospel Oak to Barking line, and one for the Romford–Upminster line - all of which have replaced Class 315 and Class 317 trains dating from the 1980s, and Class 172 trains dating from 2010.[6] Since then the planned procurement was increased to 45 four-car EMUs, with the additional six units intended for the Watford DC Line. The intention is that the five-car Class 378 trains currently used on the Watford DC line will be cascaded back to the North London line and East London Lines to allow for strengthened services. TfL issued an Invitation to Tender (ITT) in early 2015.[5]

Contract award and construction

[edit]

In July 2015, TfL announced that it had placed a £260m order for 45 four-car Bombardier Aventra EMUs, with an option for 24 more four-car units plus further options to extend some or all units including option units to five cars.[5] These are similar to the Class 345 and Class 720 trains that are currently used on the Elizabeth line and Greater Anglia services.[7]

The units were delivered in two subclasses; an AC-only version – subclass /1 – for use on the Lea Valley lines and Romford–Upminster services, and a dual-voltage version – subclass /2 – for the Watford DC and Gospel Oak to Barking line services. These carry pantographs on their PMS(W) vehicles[1] and are maintained at Willesden TMD, while the subclass /1 units are maintained at Ilford EMU Depot.[8][full citation needed] Both versions have all-longitudinal seating, after the plan to fit some transverse seats to the AC units was dropped.

In 2017, Transport for London put forward a proposal to procure nine additional Class 710 units for the purpose of capacity enhancement, using 42 of the 249 additional vehicles for which TfL held options. Of the nine units, three would be four-car units (one for the Watford DC line and two for the extension of the Gospel Oak – Barking line to Barking Riverside), while the other six would be five-car units for the North London line and West London line, allowing a cascade of Class 378 units from those lines to the East London line.[9] Following delivery, the six five-car units were renumbered from subclass /2 to subclass /3.[10]

Delays in introduction

[edit]
Class 710 at Leyton Midland Road

In April 2018, the Islington Gazette reported that the trains would be introduced three months later than scheduled due to delays in their testing.[11]

In June 2018, the Barking & Dagenham Post reported that the trains would be in service by November 2018, "almost 18 months later than planned".[12]

In November 2018, TfL said that they hoped the units would be in service by December 2018;[13] however, further delays prevented this.[14]

In January 2019, TfL announced that three Class 378 trains would temporarily be deployed on the Gospel Oak to Barking line while continued problems with the Class 710 units were resolved,[15] since leases on the existing Class 172 stock running on this line would come to an end before the 710's likely introduction into passenger service. In April 2019, the Office of Rail and Road approved the use of the Class 710, with restrictions.[16]

Operations

[edit]

In May 2019, TfL announced that approval had been gained for the Class 710s to enter passenger service. The first two units entered service on the Gospel Oak to Barking line on Thursday 23 May 2019[17] and the remaining six were in service by August 2019, with the first unit entering service on the Watford DC line on 9 September 2019.

The first units on the Lea Valley lines entered service on 3 March 2020 after a first attempt on 24 February 2020.[18] The services on the Romford–Upminster line started on 5 October 2020.[19] The Class 710/3 five-car units are operating on the Watford DC line.[20]

Incidents

[edit]

On 12 October 2021, the driver and a passenger were injured when an eight-car Class 710 train, headed by unit 710124, ran through the buffers at Enfield Town.[21][22] Following a post-incident drugs test that revealed traces of cocaine[23], the driver was arrested on suspicion of being unfit to work on a transport system through drink or drugs.[24][25] He was subsequently convicted of endangering the safety of the railway and sentenced to sixteen weeks' imprisonment.[26]

Fleet details

[edit]
Subclass Operator Qty. Year built Cars per unit Unit nos. Description
710/1 London Overground 30 2017–2020 4 710101–710130 AC-only units for the Lea Valley lines and the Romford to Upminster line.
710/2 18 710256–710273 Dual-voltage units for the Gospel Oak to Barking and Watford DC lines.
710/3 6 5 710374–710379 Dual-voltage units for the Watford DC and North London lines.

Illustration

[edit]
Class 710 four-car unit

See also

[edit]

Notes

[edit]

References

[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

British Rail Class 710

View on Grokipedia
from Grokipedia
The British Rail Class 710 is a family of electric multiple-unit (EMU) commuter trains manufactured by Bombardier Transportation (now Alstom) as the inaugural variant of the Aventra platform, designed specifically for the London Overground network operated by Transport for London (TfL).[1] These air-conditioned, walk-through four-car sets—capable of coupling into longer formations up to 12 cars—with a maximum speed of 75 mph (120 km/h), feature lightweight aluminium bodies, regenerative braking, and dual-voltage capability (25 kV AC overhead or 750 V DC third rail) on select units to serve electrified suburban routes.[2][3] Introduced to replace older diesel and electric fleets, they nearly double passenger capacity to around 700 per unit while enhancing energy efficiency, accessibility, and passenger amenities such as Wi-Fi, USB charging points, LED information displays, and intelligent climate control.[4] Procured under a £260 million contract awarded to Bombardier in July 2015, the Class 710 fleet comprises 54 units built at the Derby Litchurch Lane works between 2015 and 2019, including 30 single-voltage AC sets for non-third-rail routes and 24 dual-voltage units (18 four-car and six five-car) for routes with third-rail sections.[1][2] The first units entered testing in 2018 but faced delays due to certification issues, with passenger operations commencing on 23 May 2019 on the Gospel Oak to Barking line (GOBLIN), where they fully replaced Class 172 diesel multiple units by August 2019, enabling electrification and increased frequencies up to four trains per hour.[4][5] The full fleet of 54 units entered service by November 2020. Subsequent deployments expanded to the Watford DC line (from March 2020), as well as the Enfield Town, Chingford, and Cheshunt branches, supporting the 2022 Barking Riverside extension and overall network growth to 20 trains per hour on key corridors.[4][3] Equipped with Bombardier FLEXX Eco bogies, three-phase AC traction motors, and Knorr-Bremse braking systems, the Class 710 operates under driver-only rules with onboard CCTV and passenger information systems, weighing approximately 144–182 tonnes depending on configuration and tare.[2] Maintenance is handled by Bombardier at depots in Willesden and Ilford, ensuring high reliability for TfL's concessionaire Arriva Rail London, which took over operations in November 2016.[1][2] Notable for their spacious saloons with two or three doors per side and priority seating for accessibility, these trains represent a key step in modernizing London's suburban rail infrastructure, prioritizing sustainability and user experience amid growing demand.[4][5]

Design and Specifications

Overview

The British Rail Class 710 is a family of electric multiple units (EMUs) developed as part of Bombardier's Aventra platform, specifically designed and built for Transport for London (TfL) to serve the London Overground network.[6] These trains represent the first production variant of the Aventra family to enter revenue service, featuring modern walk-through carriages constructed from lightweight aluminium for improved energy efficiency.[3] The primary role of the Class 710 is to replace ageing diesel Class 172 Turbostar units on electrified suburban routes, thereby doubling passenger capacity to nearly 700 per four-car set while eliminating diesel emissions to support TfL's environmental goals.[7] This transition aligns with the broader electrification programme of London Overground lines, such as the Gospel Oak to Barking route completed in 2018.[8] Distinguishing features include four-car and five-car variants, with certain units equipped for dual-voltage operation under 25 kV 50 Hz AC overhead electrification and 750 V DC third-rail systems to accommodate diverse route requirements.[3] All units achieve a maximum speed of 75 mph (120 km/h) and incorporate passenger-focused amenities like air-conditioning, free Wi-Fi, USB charging points, and enhanced accessibility provisions.[6] Built by Bombardier Transportation at the Derby Litchurch Lane Works, the Class 710 fleet totals 54 units, with the first entering passenger service on 23 May 2019.[8]

Technical Features

The British Rail Class 710 units employ a 3-phase AC traction system powered by asynchronous motors, with two motored axles per car to optimize energy efficiency and performance.[2] This setup incorporates regenerative braking, which captures kinetic energy during deceleration and feeds it back into the power supply, reducing overall energy consumption.[2] The trains feature Bombardier FLEXX Eco bogies, designed for lightweight construction and low maintenance, enhancing ride comfort and reducing track wear.[2] The body structure utilizes aluminum construction, contributing to the units' lightweight efficiency and improved acceleration capabilities compared to heavier steel alternatives.[2] Power supply varies by subclass: the /1 units are AC-only, operating solely on 25 kV AC overhead lines, while the /2 and /3 subclasses are dual-voltage, compatible with both 25 kV AC overhead and 750 V DC third rail systems for versatile route deployment.[2] All units operate on a standard track gauge of 1,435 mm.[2] Passenger amenities include roof-mounted air-conditioning modules per car, delivering cooled air via ceiling ducts for consistent comfort across all vehicles, with separate cab conditioning on driving motor cars.[2] LED lighting provides energy-efficient illumination throughout the interiors, supporting the Aventra platform's focus on sustainability.[9] Security is enhanced by CCTV systems, including bodyside cameras monitoring door areas to aid safe operations.[10] Passenger information systems (PIS) feature real-time digital screens for route and service updates, while dedicated wheelchair-accessible spaces ensure compliance with Persons with Reduced Mobility Technical Specifications for Interoperability (PRM-TSI).[11][12] In terms of dimensions, the 4-car formations measure 82.87 m in length and 2.772 m in width, whereas the 5-car formations extend to 102.86 m in length with the same width, allowing for efficient platform utilization on the London Overground network.[2]

History

Background and Planning

In the early 2010s, the Gospel Oak to Barking line (GOBLIN), operated by London Overground, faced significant overcrowding issues despite the introduction of Class 172 two-car diesel multiple units (DMUs) in 2010, which provided about a third more capacity than the previous Class 150 units but proved insufficient by 2012 to meet growing passenger demand.[13][1] Transport for London (TfL) announced plans in 2013 to address this capacity shortfall as part of broader efforts to enhance the London Overground network, recognizing the line's role in serving key orbital routes in north and east London.[14] By June 2013, TfL confirmed the electrification of the GOBLIN as a key infrastructure upgrade, secured through a £90 million scheme funded by the government and TfL (with TfL contributing £25 million) within a larger multi-year capital settlement, enabling a shift from DMUs to electric multiple units (EMUs) for improved environmental performance, reduced emissions, lower maintenance costs, and higher capacity through longer train formations.[15] This decision aligned with national rail investment priorities under Control Period 5 (2014–2019), prioritizing electrification to support sustainable urban rail growth.[16] The GOBLIN electrification formed part of wider London Overground expansion strategies outlined in the 2013 TfL funding settlement, which included devolution of the West Anglia suburban services (encompassing the Lea Valley lines) to TfL control and enhancements to the already-electrified Watford DC line to integrate more seamlessly with the network.[15] These initiatives aimed to extend the Overground's reach, boost connectivity across London, and accommodate projected passenger growth through targeted electrification and service upgrades on multiple routes.[17] Initial specifications for the new EMUs, outlined in TfL's 2014 tender process, called for four-car formations to replace the two-car DMUs, with provisions for dual-voltage capability (25 kV AC overhead and 750 V DC third rail) to allow flexible deployment across electrified lines like the Watford DC route, and options to extend to longer consists for future capacity needs.[18] The Class 710 units were based on Bombardier's Aventra platform to ensure compatibility with ongoing Overground standardization efforts.[5]

Procurement and Construction

In July 2015, Transport for London (TfL) awarded Bombardier Transportation a £260 million contract to supply 45 four-car electric multiple units (EMUs) as part of the Aventra family, including options for up to 249 additional units to support future capacity needs on London Overground services.[1] This procurement followed a competitive tender process aimed at replacing older diesel and electric fleets with modern, energy-efficient trains capable of operating on newly electrified routes. The initial order focused on AC-only units for lines such as the West Anglia Main Line and the Romford–Upminster branch, with the contract emphasizing advanced features like regenerative braking and passenger information systems. In October 2017, TfL exercised an option under the original agreement to order nine additional Class 710 units from Bombardier, comprising three four-car dual-voltage sets and six five-car dual-voltage sets, to enhance capacity on routes including the Gospel Oak to Barking and Euston to Watford lines.[19][20] This brought the total fleet to 54 units, with the subclass breakdown consisting of 30 AC-only four-car /1 units, 18 dual-voltage four-car /2 units, and six dual-voltage five-car /3 units.[8] Construction of the Class 710 fleet began in 2017 at Bombardier's Litchurch Lane Works in Derby, UK, with the first completed unit delivered to TfL in June 2018.[21] Production continued through 2020, incorporating aluminum bodyshells, FLEXX Eco bogies, and three-phase AC traction systems standardized across the subclasses. Following Alstom's acquisition of Bombardier Transportation in January 2021, the Derby facility—now under Alstom ownership—completed any remaining assembly and support activities for the Class 710 program.[22][23]

Testing and Delays

The introduction of the British Rail Class 710 electric multiple units faced significant delays, with the planned entry into passenger service in May 2018 postponed to May 2019 primarily due to software-related issues affecting the trains' systems. These problems, stemming from the advanced Aventra platform's complex software architecture, required extensive revisions by manufacturer Bombardier Transportation to ensure reliability and compliance.[24][25] Testing commenced with static trials on the first completed unit in August 2017 at Bombardier's facilities, focusing on system integration and basic functionality. By late 2017, the prototype had been delivered to Network Rail's test track at Asfordby for further evaluation, including dynamic running tests in 2018 that incorporated software for safety features such as the Train Protection and Warning System (TPWS) and Automatic Warning System (AWS). Mainline dynamic trials began in September 2018 on routes compatible with the units, allowing for real-world validation of performance under operational conditions.[20][26][27] Regulatory hurdles further contributed to the postponement, as obtaining full certification from the Office of Rail and Road (ORR) involved protracted reviews of safety and interoperability standards developed by the Rail Safety and Standards Board (RSSB). The ORR issued initial interoperability authorisations for the Class 710/2 variant in April 2019 and for the Class 710/1 in August 2019, clearing the path for deployment. These delays necessitated the temporary retention of Class 172 diesel multiple units on affected routes, with the first Class 710 passenger service operating on the Gospel Oak to Barking line on 23 May 2019.[28][29]

Operations

Introduction to Service

The British Rail Class 710 electric multiple units made their passenger service debut on the London Overground's Gospel Oak to Barking line on 23 May 2019, marking the start of a transition to fully electric operations on the route. The initial introduction consisted of two four-car units from the /2 subclass, designed as dual-voltage trains capable of operating under the line's 25 kV AC overhead electrification system, which had been completed in January 2018 following a major upgrade project. This electrification enabled the shift away from diesel-powered services, providing a more efficient and environmentally friendly alternative.[5] The rollout followed the phased withdrawal of the preceding Class 172 diesel multiple units, whose leases expired in March 2019, prompting their transfer to other operators. In the intervening period from late January 2019, Transport for London deployed modified Class 378 electric units—originally third-rail compatible—as a temporary measure to maintain services while the Class 710 fleet underwent final approvals. Concurrently, driver training programs were implemented for the new electric multiple units, with around one-third of the Gospel Oak to Barking line's drivers having completed training by the debut date to ensure safe and proficient operation. By August 2019, all eight Class 710/2 units allocated to the route had entered service, fully replacing the temporary and legacy stock for exclusive electric operation. This completion doubled the line's capacity compared to the prior two-car diesel formations and facilitated the restoration of the pre-disruption timetable in June 2019, reinstating four trains per hour. Early operations in the subsequent months highlighted improved reliability and reduced journey times, attributed to the units' enhanced performance and the benefits of electrification.

Route Deployments

The British Rail Class 710 units were first introduced to passenger service on the Gospel Oak to Barking line, now designated as the Suffragette line, on 23 May 2019, marking the primary deployment route for the dual-voltage /2 subclass to support the fully electrified diesel-free operation.[5] These four-car units initially supplemented existing Class 378 stock, enabling a full four trains per hour frequency by late summer 2019, with adaptations including onboard Wi-Fi and enhanced passenger information systems to improve reliability on this 14-mile East London corridor.[5] Deployment expanded to the Watford DC line on 9 September 2019, utilizing the dual-voltage /2 subclass to accommodate the route's third-rail electrification between Euston and Watford Junction, replacing older Class 350 units and providing seamless integration with the DC network.[30] This 20-mile service saw phased rollout of the new trains, which feature air-conditioning and accessible designs suited to the high-frequency commuter demands, with ongoing fleet integration continuing until 2024.[30] From 3 March 2020, four-car Class 710/1 units entered service on the Lea Valley lines, covering the Enfield Town and Cheshunt branches from London Liverpool Street, replacing Class 317 stock.[31] The deployment boosted capacity by approximately 10% and incorporated features like live seat availability displays to enhance the experience on services extending up to 12 miles northeast.[31] The Romford–Upminster shuttle service adopted Class 710/1 units starting in October 2020, transforming the 5.4-mile single-line operation with modern electric multiple-units that support twice-hourly frequencies and better accessibility for local passengers.[32] In 2024, Transport for London implemented new line branding, renaming the Watford DC route as the Lioness line (yellow) to honor England's women's football team and the Gospel Oak to Barking service as the Suffragette line (green) in recognition of the East End's suffragette history, with updates to station signage and Class 710 onboard systems, which were completed in January 2025.[33][34] These changes facilitate clearer navigation and integration with the Elizabeth line at key interchanges like Stratford and Liverpool Street for Lea Valley services.[33]

Performance and Recent Developments

The Class 710 trains offer increased passenger capacity, nearly doubling passenger capacity compared to the preceding two-car Class 172 diesel multiple units on routes such as the Gospel Oak to Barking line, enabling better accommodation of demand through walk-through interiors and modern seating arrangements.[35] Post-2020, the fleet has maintained high reliability and availability, supported by software updates that address initial teething issues and enhance overall energy efficiency through optimized traction control and regenerative braking systems. The complete fleet of 54 units was in service by March 2024.[36] Between 2023 and 2025, the London Overground upgrade project has focused on integrating Class 710 enhancements, including improved passenger information systems on the trains, alongside station upgrades to support more frequent services across the network.[33] Full operation of the Aventra-based Class 710 fleet on the Gospel Oak to Barking line was achieved by late 2020, with ongoing refinements ensuring seamless electric services by 2024.[8] Future plans include potential extensions for additional units to boost capacity on expanding routes, though no new orders have been confirmed as of 2025.[20] The electrification enabled by the Class 710 has significantly reduced emissions compared to the diesel Class 172 operations, aligning with broader environmental goals through lower direct tailpipe pollutants and efficient energy use.[37]

Fleet Details

Subclasses and Formations

The British Rail Class 710 fleet comprises three subclasses, differentiated by power supply capabilities, unit length, and intended route deployments, with a total of 54 units constructed between 2017 and 2020 by Bombardier Transportation at their Derby Litchurch Lane Works.[31] The /1 subclass includes 30 four-car units numbered 710101 to 710130, designed as AC-only units for routes without third-rail electrification, such as the Lea Valley lines and the Romford to Upminster shuttle.[21][38] These units operate under 25 kV AC overhead line equipment exclusively.[39] The /2 subclass consists of 18 four-car dual-voltage units numbered 710256 to 710273, equipped for both 25 kV AC overhead and 750 V DC third-rail systems to support mixed electrification routes like the Gospel Oak to Barking line and parts of the Watford DC line.[5][39] The /3 subclass features 6 five-car dual-voltage units numbered 710374 to 710379, also capable of 25 kV AC and 750 V DC operation but with an additional car for increased capacity on the Watford DC line.[40][41]
SubclassNumber of UnitsFormation LengthPower SupplyNumbering RangePrimary Routes
710/1304 cars25 kV AC only710101–710130Lea Valley lines, Romford–Upminster
710/2184 carsDual-voltage (25 kV AC / 750 V DC)710256–710273Gospel Oak–Barking, Watford DC
710/365 carsDual-voltage (25 kV AC / 750 V DC)710374–710379Watford DC line
All four-car units (/1 and /2) follow a fixed formation of driving motor standard (DMS), pantograph motor standard with wheelchair bay (PMS(W)), motor standard (MS), and driving motor standard (DMS), providing powered bogies on the motor cars for efficient traction distribution. The five-car /3 units extend this with an additional intermediate motor standard car, arranged as DMS-MS-PMS(W)-MS-DMS to balance weight and power. In simplified terms, four-car formations consist of motor-trailer-motor-trailer (M-T-M-T), while five-car units are M-T-M-T-M, with motor cars housing traction equipment and trailers unpowered.[42]

Capacity and Configurations

The British Rail Class 710 trains feature a passenger capacity of 189 standard seats and 489 standees in four-car formations, yielding a total of approximately 678 passengers per unit. Five-car formations provide 241 standard seats and accommodation for 614 standees, resulting in a total capacity of around 855 passengers. These figures reflect the design emphasis on high-volume commuter services, doubling the capacity of predecessor diesel units on routes like Gospel Oak to Barking.[7] Internally, the units employ longitudinal bench seating throughout to maximize standing space during peak hours, with two or three doors per side per car facilitating rapid boarding and alighting. Priority seating areas are designated near doors for passengers requiring assistance, alongside dedicated wheelchair bays that ensure secure accommodation. Luggage areas are integrated into end vestibules, supporting commuters with bags. Accessibility features comply with the Disability Discrimination Act (DDA), including low-floor entry for step-free access where platforms permit, audio-visual passenger announcements, and induction loops for hearing aid users. Each unit includes multiple wheelchair bays equipped with restraints and adjacent companion seating.[43] All Class 710 configurations are unclassed, lacking dedicated first-class accommodation to prioritize standard passenger volume on London Overground networks. Bike spaces are provided in designated areas, typically accommodating two bicycles per unit with secure fixings.[4] The /3 subclass, comprising five-car units, offers enhanced capacity specifically for peak-time services on the Watford DC line, where higher passenger loads demand the additional seating and standing room compared to the four-car /1 and /2 variants.[44]

Liveries and Modifications

The Class 710 units were delivered in the standard London Overground livery, consisting of a white body with a black window band, orange doors, and an orange front-end warning panel.[45] This scheme has remained consistent across the fleet since introduction, providing a distinctive visual identity aligned with Transport for London's branding.[46] In 2024, minor updates were applied to support the rebranding of London Overground routes, including the Suffragette line (Gospel Oak to Barking Riverside). These primarily involved internal modifications to the passenger information systems (PIS) on Class 710 trains, incorporating green-themed elements for the Suffragette line (green), yellow-themed elements for the Lioness line (Watford DC), and updated announcements to reflect the new line names and colors, with full implementation completed in January 2025.[34][33] No external decals or structural alterations to the livery were introduced as part of this process.[33] Post-delivery modifications to the Class 710 fleet have focused on software enhancements rather than hardware changes. Following entry into service in 2019, Transport for London implemented software patches starting in 2020 to address reliability issues in the train control systems and traction performance, improving overall operational stability.[47] Additional updates to the PIS software were rolled out in subsequent years to enhance passenger information accuracy and integration with network-wide systems.[48] Under Alstom's stewardship—following the 2021 acquisition of Bombardier Transportation—further enhancements have included preparations for digital signaling integration, with the Office of Rail and Road granting upgrade authorization for Class 710/1 and /2 units in September 2024 to support advanced train management features.[49] These upgrades aim to align the fleet with evolving rail standards, such as improved interoperability, without requiring major structural modifications.[50] All Class 710 units are maintained at Transport for London depots, primarily Willesden Traction Maintenance Depot, under a long-term contract extended to 2035.[46] Routine servicing at these facilities ensures the fleet's livery and minor modifications remain standardized, with no significant structural alterations reported across the operational life to date.[50]

Incidents and Safety

Notable Incidents

On 12 October 2021, a London Overground train formed of two four-car Class 710 units, led by unit 710124, collided with the buffer stops at Enfield Town station during the morning rush hour. The eight-car formation, operated by Arriva Rail London, was approaching the terminus on the Enfield Town branch when the driver failed to apply the brakes effectively, resulting in the train striking the buffers at a speed of 7.7 mph (12 km/h). The impact caused the front bogie to derail and ride over the stops, damaging the buffer assembly and the leading car's underframe, but the train remained on the track overall.[51][52] Two people sustained minor injuries in the incident: one received treatment for a leg injury accompanied by traumatic shock, while the other was treated for traumatic shock alone; neither required hospital admission. The 75 passengers on board were evacuated safely, with no serious harm reported. The Rail Accident Investigation Branch (RAIB) investigation, published on 6 July 2023, determined the underlying cause as the driver's loss of awareness due to significant fatigue—he had slept only about one hour the previous night—and the influence of cocaine, confirmed by post-incident urine and hair tests showing recent recreational use. The driver had briefly braked the train to 9.8 mph (16 km/h) when 69 meters from the buffers but then took no further action for over seven seconds before applying the emergency brake too late; no signal was passed at danger, as the approach signal displayed a caution aspect appropriate for the terminal stop.[53][51][54] The driver, Erkan Mehmet, was charged with endangering the safety of the railway and pleaded guilty at Inner London Crown Court. On 7 July 2023, he was sentenced to 16 weeks' imprisonment, with the court noting his admission of falling asleep at the controls due to fatigue and drug impairment. RAIB's report highlighted systemic issues, including the driver's reluctance to report fatigue for fear of attendance repercussions and inadequate employer monitoring, leading to recommendations for improved fatigue risk management at Arriva Rail London and better buffer stop risk assessments by Network Rail and the Rail Safety and Standards Board.[55][56][53] On 17 July 2024, a passenger's hand became trapped in the closing doors of a Class 710 train (service 2U67, 18:07 from Enfield Town to London Liverpool Street) at Enfield Town station. The train departed, dragging the passenger approximately 60 meters at 11 mph (18 km/h) before the emergency door release was activated to stop it. The passenger sustained minor physical injuries and psychological distress, requiring hospitalization. The RAIB safety digest (D09/2024) identified the cause as the driver's failure to detect the trapped passenger during the final safety check via CCTV, compounded by the door system's limitation in detecting objects thinner than 30 mm, which prevented automatic reopening. No broader systemic failures were noted, but it highlighted ongoing vigilance needs for door operations.[57] Additionally, three door-trapping incidents occurred in June 2022 involving Class 710 units operated by Arriva Rail London: on 23 June at Seven Sisters (hand trapped, train moved 36 meters at up to 8 mph, no injuries); 27 June at Wembley Central (object trapped, train moved 5 meters at 3 mph, no injuries); and 29 June at Crouch Hill (umbrella trapped, train moved 11 meters at 6 mph, no injuries). These were attributed to driver oversight and limitations in CCTV alignment and door interlock detection, as detailed in RAIB safety digest D05/2022.[10] As of November 2025, the 2021 Enfield Town collision is the only major incident involving Class 710 units resulting in a derailment, though additional minor incidents, including door malfunctions leading to one case of minor injuries in 2024, have been reported without fatalities or significant derailments.[53]

Safety Features and Record

The British Rail Class 710 electric multiple units are equipped with several standard safety systems mandated for UK passenger trains, including the Automatic Warning System (AWS) and Train Protection & Warning System (TPWS), which provide audible and visual warnings to drivers to prevent signals passed at danger and overspeeding.[58] These systems operate in standalone mode initially, with full integration achieved following Office of Rail and Road (ORR) authorizations for multi-unit operations. Additionally, the trains feature electro-pneumatic disc braking supplied by Knorr-Bremse (RZKK and RZTS systems) with regenerative capabilities, enabling efficient deceleration while recovering energy, and a vigilance device integrated into the driver's controls to ensure attentiveness, functioning as a modern equivalent to the traditional deadman's handle.[2] Passenger safety is further enhanced by door systems with obstacle detection to prevent trapping incidents and emergency lighting powered by an independent supply for evacuation in power failures.[2] Real-time CCTV monitoring includes bodyside-mounted cameras feeding images to two in-cab monitors for driver-only operation (DOO), allowing observation of platforms and doors, while saloon CCTV footage is digitally recorded and accessible from the cab for incident review.[2][59] Since their introduction in 2019, Class 710 units have maintained a low incident rate on the London Overground network, with no passenger or workforce fatalities reported and stable health and safety performance as assessed in the ORR's annual health and safety report for 2024-25.[60] The fleet demonstrates high compliance with ORR interoperability and safety standards, including upgrades authorized in 2020–2024 for enhanced multi-unit coupling and signaling integration, though minor technical issues have been addressed without compromising overall safety.[61][49] Excluding the 2021 collision and the 2024 door incident (both low-injury events), injuries have been minimal, reflecting effective risk management during fleet rollout.[60] Compared to the diesel-powered Class 172 Turbostars they replaced on certain routes, the Class 710 offers improved safety through electric traction, which eliminates diesel fuel-related fire and emission risks, combined with modern TPWS and regenerative braking for more controlled stops.[62]

References

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  6. First new state-of-the-art London Overground train unveiled - TfL
  7. TfL unveils class 710 EMUs for London Overground
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  9. FOI request detail - TfL LED Lighting Upgrades
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  21. Nine more Class 710s planned - Modern Railways
  22. Class 710 Aventras on the Romford to Upminster Line - To The Trains
  23. completion of the acquisition of Bombardier Transportation - Alstom
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  31. '710s' DEBUT ON WATFORD DC SERVICES - Modern Railways
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  51. BOMBARDIER ASSUMES RESPONSIBILITY FOR WILLESDEN ...
  52. [PDF] Buffer stop collision at Enfield Town station 12 October 2021 - GOV.UK
  53. Enfield crash driver tested positive for drugs - Modern Railways
  54. Report 13/2022: Buffer stop collision at Enfield Town station - GOV.UK
  55. Enfield train crash: Driver tested positive for cocaine - BBC
  56. Enfield train crash: Driver who tested positive for cocaine jailed - BBC
  57. Driver who derailed Overground train at Enfield Town jailed
  58. New London Overground Class 710/2 train obtains conditional ...
  59. [PDF] Passenger trapped in doors and dragged at Wood Street station ...
  60. [PDF] Annual Report of Health and Safety Performance on Britain's Railways
  61. Interoperability authorisation - Bombardier Transportation UK Ltd
  62. [PDF] RAIB Report: Explosion inside an underframe equipment case at ...
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