British Rail Class 315

British Rail Class 315
TfL Rail Class 315 at Forest Gate in 2015
The refreshed interior of a TfL Rail Class 315
In service	1980 – 9 December 2022
Manufacturer	British Rail Engineering Limited
Built at	Holgate Road Works, York
Family name	BREL 1972
Replaced	Class 105 Class 306
Constructed	1980–1981
Refurbished	All units: 2004–2008 (at Bombardier Derby) LO & TfL Rail units: 2015–2016 (at Bombardier Ilford)
Scrapped	2022 - 2023
Number built	61
Number preserved	1
Number scrapped	60
Successor	Class 345 Class 710
Formation	4 cars per unit: DMSO-PTSO-TSO-DMSO
Diagram	DMSO vehicles: EA207 PTSO vehicles: EH217 TSO vehicles: EH216
Fleet numbers	315801–315861
Capacity	As built: 318 seats Post-2012: 309 seats, plus 7 tip-up
Owner	Eversholt Rail Group
Operators	British Rail First Great Eastern Greater Anglia London Overground MTR Elizabeth line National Express East Anglia Network SouthEast TfL Rail West Anglia Great Northern
Specifications
Car body construction	Steel underframe with aluminium body and roof
Car length	DM vehs.: 19.800 m (64 ft 11.5 in) Trailers: 19.920 m (65 ft 4.3 in)
Width	2.820 m (9 ft 3.0 in)
Height	3.582 m (11 ft 9.0 in)
Floor height	1.156 m (3 ft 9.5 in)
Doors	Double-leaf pocket sliding, each 1.288 m (4 ft 2.7 in) wide (2 per side per car)
Wheelbase	Over bogie centres: 14.170 m (46 ft 5.9 in)
Maximum speed	75 mph (121 km/h)
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)
Traction motors	8 total; 4 per DMSO vehicle (Brush TM61-53 or GEC G310AZ, interchangeably)
Power output	660 kW (880 hp)
Acceleration	0.75 m/s2 (2.5 ft/s2)
HVAC	Ducted warm air
Electric system	25 kV 50 Hz AC overhead
Current collection	Pantograph
UIC classification	Bo′Bo′+2′2′+2′2′+Bo′Bo′
Bogies	BREL BX1
Minimum turning radius	70.4 m (231 ft 0 in)
Braking system	Electro-pneumatic (disc)
Safety systems	AWS TPWS
Coupling system	Tightlock
Multiple working	Within class
Track gauge	1,435 mm (4 ft 8+1⁄2 in) standard gauge
Notes/references
Specifications as at November 1987 except where otherwise noted.

The British Rail Class 315 is a class of alternating current (AC) electric multiple unit (EMU) trains that were built by British Rail Engineering Limited at Holgate Road Carriage Works in York between 1980 and 1981 to replace the Class 306 units. It was a variant of unit derived from British Rail's 1971 prototype suburban EMU design which, as the BREL 1972 family, eventually encompassed 755 vehicles across Classes 313, 314, 315, 507 and 508. Revenue services with Class 315 units commenced in 1980 and continued until 9 December 2022.