British Rail Class 710
|British Rail Class 710 Aventra|
|In service||23 May 2019 – present|
|Built at||Derby Litchurch Lane Works|
|Constructed||2017 - 2020|
|Number built||54 units|
|Formation||4 or 5 carriages per unit|
|Capacity||4 car - 189 Seats, 489 Standing |
5 car - 241 Seats, 641 Standing
Ilford EMU Depot
|Train length||5 car - 102.85 m (337 ft 5+1⁄4 in) |
4 car - 82.86 m (271 ft 10+1⁄4 in)
|Car length||19.99 m (65 ft 7 in)|
21.446 m (70 ft 4 in) (End cars)
|Width||2.772 m (9 ft 1 in)|
|Height||3.76 m (12 ft 4 in)|
|Maximum speed||75 mph (121 km/h)|
|Weight||4 car AC Unit - 144 t (142 long tons; 159 short tons)|
4 car DV Unit - 151 t (149 long tons; 166 short tons)
5 car DV Unit - 182 t (179 long tons; 201 short tons)
|Current collection method||Pantograph (AC)|
Contact shoe (DC)
|Bogies||Bombardier FLEXX Eco|
|Braking system(s)||Knorr-Bremse RZKK and RZTS with 2 actuators per axle|
|Safety system(s)||AWS, TPWS|
|Track gauge||1,435 mm (4 ft 8+1⁄2 in) standard gauge|
The British Rail Class 710 Aventra is a type of electric multiple unit passenger train 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.
Background and specifications
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. However, this proposal was subsequently shelved when the Government announced in June 2013 that the Gospel Oak to Barking line would be electrified, with proposals instead to purchase a fleet of new EMUs.
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. 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, and in June 2015 announced that Bombardier had been awarded the contract to build the new trains.
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. These are similar to the Class 345 and Class 720 trains that will be used by Crossrail and Greater Anglia.
The units are delivered in two sub-classes; an AC-only version for use on the Lea Valley lines and Romford–Upminster services, and a dual-voltage version for the Watford DC and Gospel Oak to Barking line services. Both versions will have all-longitudinal seating after the plan to have some transverse seats on the AC units was dropped. The AC only version is maintained at Ilford EMU Depot and the dual-voltage units at Willesden TMD.
In 2017, Transport for London put forward a proposal to procure nine additional Class 710 units to be used as capacity enhancers. These would cover 42 of the 249 additional vehicle options, and would be formed into three 4-car sets, one which would be for use on Watford DC line and two for the extended Gospel Oak to Barking line to Barking Riverside, and six 5-car sets for use on the North London line and West London line, allowing a cascade of Class 378 units to increase services on the East London line.
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, 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.
On 22 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 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. The services on the Romford-Upminster line started on 5 October 2020.  The Class 710/3 5 car units are operating on Watford DC line.
|Class||Operator||No. built||Year built||Cars per set||Unit nos.||Description|
|710/1||London Overground||30||2017-2020||4||710101 - 710130||AC only for Lea Valley lines and Romford–Upminster line.|
|710/2||18||710256 - 710273||Dual-voltage for Gospel Oak to Barking line and Watford DC line.|
|710/3||6||5||710374 - 710379||Dual-voltage for the Watford DC line.|
Notes and references
- Class 710 Stock - London Overground (PDF) (Report). 2019. LO-01-02-03-48-04_01. Archived from the original (PDF) on 16 April 2020. Retrieved 16 April 2020.
- "New London Overground electric trains enter service". Transport for London. Retrieved 22 May 2019.
- "TfL seeks new Barking line trains as two-car '172s' struggle". Rail (697). Peterborough. 30 May 2012.
- Butcher, Louise (27 July 2017). Briefing Paper SN05907 - Rail electrification (PDF). House of Commons Library (Report). Archived (PDF) from the original on 8 March 2017. Retrieved 18 September 2020.
- "More EMUs for London Overground". Railway Gazette. 9 April 2014. Retrieved 9 April 2014.
- "Bombardier wins London Overground EMU contract". Railway Gazette. 19 June 2015. Retrieved 19 June 2015.
- "London Overground Train Operating Concession" (PDF). tfl.gov.uk. Transport for London Finance and Policy Committee. 2 March 2016. Retrieved 18 March 2016.
...with the introduction of a new fleet of Class 710 trains (the LOTRAIN)...
- Rail Magazine, Issue 778, Page 14
- "Nine more 710s for LO". Today's Railways (192): 11. December 2017.
- Gelder, Sam (25 April 2018). "New Overground trains for Gospel Oak to Barking line delayed... by three months". Islington Gazette. Archant. ISSN 1478-5161. Retrieved 27 October 2018.
- Morton, Sophie (20 June 2018). "Finally! High-tech electric Overground trains to be introduced this year". Barking & Dagenham Post. Retrieved 27 October 2018.
- "Update from TfL on Barking- Gospel Oak line". Andrew Dismore. 12 November 2018. Retrieved 26 June 2021.
- Anonymous (10 December 2018). "Gospel Oak to Barking Line". Mayor's Question Time. Retrieved 11 August 2019.
- "Modified electric trains to be used temporarily on London Overground's Gospel Oak to Barking line". TfL. 25 January 2019. Retrieved 26 January 2019.
- "Interoperability authorisation of Bombardier Class 710/2 electric multiple units - Authorised 11 April 2019" (PDF). Office of Rail and Road. 11 April 2019.
- "Bombardier Class 710/1s finally make their passenger debut on West Anglia suburban routes". Rail. 4 March 2020. Retrieved 4 March 2020.
- "New London Overground electric trains enter service". Transport for London (Press release). Retrieved 22 May 2019.
- "5 car 710's renumbered". Today's railways. No. 231. 21 April 2021. p. 70.
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