British Rail Class 315 alternating current (AC) electric multiple units (EMU) were built by BREL at York works from 1980 to 1981. They were the fifth and final variety of British Rail's then-standard 1972 design 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 25 kV overhead line current collection. The fleet works inner-suburban services on the Great Eastern Main Line run by the train operating company TfL Rail out of London Liverpool Street. Class 315s also did work services from Liverpool Street to Chingford, Enfield Town and Cheshunt operated by London Overground but got discontinued in 2020.
Quick Facts In service, Manufacturer ...
| British Rail Class 315 |
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 TfL Rail Class 315 at Forest Gate in September 2015 |
 The refreshed interior of a TfL Rail Class 315 |
| In service | 1980 – 9 December 2022 |
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| Manufacturer | British Rail Engineering Limited |
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| Built at | Holgate Road Works, York |
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| Family name | BREL 1972 |
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| Replaced | |
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| Constructed | 1980–1981 |
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| Refurbished | - All units: 2004–2008 (at Bombardier Derby)[1]
- LO & TfL Rail units: 2015–2016 (at Bombardier Ilford)
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| Number built | 61[2] |
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| Number preserved | 1 |
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| Number scrapped | 53 |
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| Successor | |
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| Formation | - 4 cars per unit:
- DMSO-PTSO-TSO-DMSO
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| Diagram | - DMSO vehicles: EA207
- PTSO vehicles: EH217
- TSO vehicles: EH216
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| Fleet numbers | 315801–315861 |
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| Capacity | - As built: 318 seats
- Post-2012: 309 seats, plus 7 tip-up
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| Owners | Eversholt Rail Group |
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| Operators | |
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| Car body construction | Steel underframe with aluminium body and roof |
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| Car length | - DM vehs.: 19.800 m (64 ft 11.5 in)
- Trailers: 19.920 m (65 ft 4.3 in)
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| Width | 2.820 m (9 ft 3.0 in) |
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| Height | 3.582 m (11 ft 9.0 in) |
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| Floor height | 1.156 m (3 ft 9.5 in) |
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| Doors | Double-leaf pocket sliding, each 1.288 m (4 ft 2.7 in) wide (2 per side per car) |
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| Wheelbase | - Over bogie centres:
- 14.170 m (46 ft 5.9 in)
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| Maximum speed | 75 mph (121 km/h) |
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| Weight | - DMSO vehs.: 35.0 t (34.4 long tons; 38.6 short tons)
- PTSO vehs.: 32.0 t (31.5 long tons; 35.3 short tons)
- TSO vehs.: 25.5 t (25.1 long tons; 28.1 short tons)
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| Traction motors | - 8 total; 4 per DMSO vehicle
- (Brush TM61-53 or GEC G310AZ, interchangeably)
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| Power output | 660 kW (880 hp) |
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| Acceleration | 0.75 m/s2 (2.5 ft/s2)[3] |
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| HVAC | Ducted warm air |
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| Electric system(s) | 25 kV 50 Hz AC overhead |
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| Current collector(s) | Pantograph |
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| UIC classification | Bo′Bo′+2′2′+2′2′+Bo′Bo′ |
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| Bogies | BREL BX1 |
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| Minimum turning radius | 70.4 m (231 ft 0 in) |
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| Braking system(s) | Electro-pneumatic (disc) |
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| Safety system(s) | |
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| Coupling system | Tightlock[4] |
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| Multiple working | Within class |
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| Track gauge | 1,435 mm (4 ft 8 1⁄2 in) standard gauge |
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| Specifications as at November 1987[5] except where otherwise noted. |
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