British Rail Class 315

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British Rail Class 315
Unit 315817 at Liverpool Street.JPG
315817 at London Liverpool Street in 2015
Unit 315817 interior.JPG
315817 with London Overground branded interior, in 2015
In service 1980 - present
Manufacturer BREL York
Family name BREL 1972 "PEP"
Constructed 1980 - 1981
Refurbishment All 61 sets 2004 - 2008[1]
Bombardier Derby
Number built 61 sets
Formation 4 cars per trainset
Fleet numbers 315801 - 315861
Capacity 318 seats
Operator(s) London Overground
TfL Rail
Car length 19.80 m (65 ft 0 in)
Width 2.82 m (9 ft 3 in)
Height 3.58 m (11 ft 9 in)
Maximum speed 75 mph (121 km/h)
Weight 127.5 tonnes (125.5 long tons; 140.5 short tons)
Power output 656 kW (880 hp)
Electric system(s) 25 kV AC Overhead
Track gauge 1,435 mm (4 ft 8 12 in) standard gauge
315850 in TfL Rail livery at Romford in 2015
315817 in London Overground livery at Chingford in 2015

British Rail Class 315 alternating current (AC) electric multiple units (EMU) were built by BREL York works from 1980 to 1981. They were the fifth and final variety of British Rail's then-standard 1972 design for suburban EMUs, which eventually encompassed 755 vehicles and five Classes (Class 313/314/315/507/508). Like the Glasgow-based Class 314 units, they are only able to operate from the 25 kV overhead line.

The fleet works inner-suburban TfL-run services on the Shenfield Metro for TfL Rail and the Lea Valley Lines for London Overground out of London Liverpool Street.


Each Class 315 unit is formed of four vehicles, some vehicles are attached to another set of four vehicles to make 8 vehicles and some maybe attached to another four to make 12 vehicles on long distance journeys, such as ones to Southend Victoria or Southminster (Greater Anglia). The vehicles include: Driving Motor Standard Open (DMSO), Pantograph Trailer Standard Open (PTSO), Trailer Standard Open (TSO), and Driving Motor Standard Open (DMSO). Each DMSO carries four traction motors (315801-841 originally had Brush TM61-53 and 315842-861 had GEC G310AZ but these motors are interchangeable and nowadays any type can be found on any unit) rated at 110hp each and a main compressor and air reservoir which carries air for the brakes and suspension. The door system which was pneumatic has been replaced by an all electric door system. The PTSO carries the main and auxiliary transformers, batteries and battery charger, Stone Faiveley AMBR Mk.1 pantograph, vacuum circuit breaker and auxiliary compressor. The TSO carries no equipment other than that which is standard to all coaches.

The coaches only contain standard seating and have no toilet facilities. Car numbering is as follows:

  • 64461-64582 - DMSO
  • 71281-71341 - PTSO
  • 71389-71449 - TSO

Each 4-car set is able to seat 318 passengers.

A refurbishment programme commenced from mid-2004, when National Express East Anglia (then 'one' Railway) contracted Bombardier to carry out the refurbishment of all 61 units, starting with the ex-First Great Eastern examples. The low-back 3+2 seating is retained, so the capacity stays the same.[2]

The Class 315 units replaced the life-expired Class 306 units. They will be displaced from Shenfield Metro work as part of Crossrail, and from Lea Valley services after they are taken over by London Overground.

Current operations[edit]

Following the privatisation of British Rail, the Class 315s were divided between First Great Eastern (43 units) and West Anglia Great Northern (18 units). The leasing company HSBC Rail has owned the entire Class 315 fleet since privatisation, though it has since been renamed Eversholt Rail Group.[3]

From 1 April 2004, National Express East Anglia (NXEA) won the inaugural Greater Anglia rail franchise, which combined the previous operations of both First Great Eastern and WAGN, meaning the two Class 315 fleets were combined. The franchise was initially known as 'One' but was rebranded National Express East Anglia (NXEA) by its parent company, National Express Group in February 2008.[4]

Until 31 May 2015, the operator of the 315s was Abellio Greater Anglia, which replaced National Express from February 2012. They are replacing the old livery on all of these trains and are refreshing the interiors to include a Passenger Information System and a flexible space for wheelchairs and cycles which includes tip-up seating and 'call to aid' buttons.[5]

The current operators are London Overground, who use sets 315801 - 315817 on West Anglia inner services and Romford to Upminster services. They are also operated by London Overground's sister company, TfL Rail, who use sets 315818 - 315861 on Shenfield metro services.


The Class 315s operate local services out of London Liverpool Street to Shenfield (the popular Shenfield Metro service) on the Great Eastern Main Line and Cheshunt, Enfield Town and Chingford on the Lea Valley Lines. They are also seen on the Upminster Branch Line between Romford and Upminster, a duty shared with Class 317s.

However, until the end of operation by Abellio Greater Anglia, a number of them were found running further afield, running on the Great Eastern and West Anglia Main Lines at peak times only to Bishop's Stortford, Broxbourne, Southminster and Southend Victoria. They also cover for unavailable Class 360s, Class 321s or Class 90s on these services as often 315s are the only spare trains available. During National Express' operation of the franchise, it was rare for 315s to run beyond Shenfield, but since Abellio began running the railway, the practice has become more common. These units only run to Cambridge, Ely, King's Lynn, Stansted Airport, Braintree, Colchester, Clacton-on-Sea, Walton-on-the-Naze, Harwich Town and Ipswich when the normal units used on these services are not available.

Initially, the Shenfield Metro and Upminster Branch Line services used only sets 315801-843 and the Lea Valley Lines only 315844-861, reflecting the allocations of the former franchises. All 61 sets were then used interchangeably, operating out of Ilford depot.


In July 2015 TfL announced that it would place a £260m order for 45 Bombardier Aventra EMUs, similar to those that will be used by Crossrail, to be introduced on the West Anglia Routes, taken over from Abellio Greater Anglia on 31 May 2015, in 2018.[6]

As most duties of the 315s will be taken over by new Class 345 Aventra trains once Crossrail is built, it has been suggested that the 315s could be cascaded to the Wales and Borders passenger franchise to be used on Valley Lines services in the Cardiff area following electrification.[7][8]


Five Class 315 sets have now been named:

  • 315812 - "London Borough of Newham Host Borough 2012 Olympics Bid" (denamed)
  • 315817 - "Transport for London"
  • 315829 - "London Borough of Havering Celebrating 40 Years"
  • 315845 - "Herbie Woodward"
  • 315857 - "Stratford Connections" (denamed)


Fleet details[edit]

Class Operator No. Built Year Built Cars per Set Unit nos.
Class 315 London Overground 17 1980–1981 4 315801 - 315817
TfL Rail 44 315818 - 315861


  1. ^ "News Desk" (PDF). Railway Herald (125). 2008-03-21. p. 4. Retrieved 2011-07-15. 
  2. ^ National Express invests in upgrade of class 315 fleet - National Express East Anglia. Retrieved 2011-07-15.
  3. ^ Class 315 Electric Multiple Unit - Eversholt Rail Group. Retrieved 2013-12-24.
  4. ^ New brand, new name, new era - National Express Group. Retrieved 14 September 2014.
  5. ^ First refurbished Class 315 units enter service - Greater Anglia. Retrieved 2013-12-24.
  6. ^ Rail Magazine, Issue 778, Page 14
  7. ^ Haigh, Philip (19 March 2014). "Nationwide railway investment on an unprecedented scale". RAIL (744): 34–37. 
  8. ^ Ove Arup & Partners Ltd (June 2012). "Valley Lines Electrification - Outline Business Case - June 2012". pp. 4.4.1 – Rolling Stock & Table 4.2 – Proxy Rolling Stock Types.