British Rail Class 313

Class 313 electric multiple units were built by BREL at York Works from 1976-77, these being the first second-generation EMUs to be constructed for British Rail. They were also the first dual-voltage units to be built, capable of drawing power via 25 kV AC overhead, or 750 V DC third-rail, and the first units in Britain to have fully automatic couplers which allowed both physical coupling and also the connection of control electric and air supplies to be carried out without the need to leave the cab. Their passenger seats were an improvement on former types.

British Rail Class 313
Southern Class 313 at Brighton
Interior of a Southern refurbished Class 313/2 unit
In service	1976–2023
Manufacturer	British Rail Engineering Limited
Built at	Holgate Road Works, York
Family name	BREL 1972
Replaced	Class 105 Class 106 Class 501 Class 377/3
Constructed	1976–1977
Refurbished	1997–2001 (Silverlink) 1999–2003 (WAGN) 2010–2011 (Southern)
Scrapped	2019, 2023
Number built	64[1]
Number preserved	2
Number scrapped	62
Successor	Class 378 (London Overground) Class 717 (Great Northern) Class 377 (Southern)[2]
Formation	3 cars per unit: DMSO-PTSO-BDMSO
Diagram	DMSO vehicles: EA204 TSO vehicles: EH210 BDMSO vehicles: EI201
Capacity	As built: 232 seats Great Northern: 231 seats Overground: 202 seats Silverlink: 228 seats Southern: 202 seats
Owners	Beacon Rail[3] Eversholt Rail Group[4]
Operators	British Rail Network Rail Network SouthEast Silverlink London Overground West Anglia Great Northern First Capital Connect Great Northern Southern
Depots	Lovers Walk (Brighton) Clacton[4]
Lines served	East Coastway Seaford Branch West Coastway
Specifications
Car body construction	Steel underframe with aluminium body and roof [note 1]
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	1.146 m (3 ft 9.1 in)
Doors	Double-leaf pocket sliding, each 1.288 m (4 ft 2.7 in) wide (2 per side per car)
Wheel diameter	840 mm (33 in) new[6]
Wheelbase	Over bogie centres: 14.170 m (46 ft 5.9 in)
Maximum speed	75 mph (120 km/h)
Weight	DMSO vehs.: 35.87 t (35.30 LT; 39.54 ST) PTSO vehs.: 31.28 t (30.79 LT; 34.48 ST) BDMSO vehs.: 37.55 t (36.96 LT; 41.39 ST) Total: 104.70 t (103.05 LT; 115.41 ST)[6]
Traction motors	8 × GEC G310AZ (82 kW (110 hp) each, 4 per motor car)
Power output	656 kW (880 hp)
Tractive effort	90.7 kN (20,400 lbf) starting[6]
Acceleration	0.79 m/s2 (2.6 ft/s2)[7]
Deceleration	0.92 m/s2 (3.0 ft/s2)[7]
Electric system(s)	25 kV 50 Hz AC overhead[note 2] 750 V DC third rail
Current collector(s)	Pantograph (AC) Contact shoe (DC)
UIC classification	Bo′Bo′+2′2′+Bo′Bo′
Bogies	BREL BX1
Minimum turning radius	70.4 m (231 ft 0 in)
Braking system(s)	Electro-pneumatic (disc) and rheostatic ('Westcode' three-step)[8]
Safety system(s)	AWS TPWS Tripcock (NCL units only)
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 August 1982[5] except where otherwise noted.

Class 313/0, no. 313064 at London King's Cross on 8th February 2003. This unit is painted in WAGN family travelcard advertising-livery.

Class 313/1, no. 313114 arriving at Clapham Junction on 30th October 2004 with a service from Willesden Junction. This unit is painted in Silverlink Metro livery.

Unit 313033 sports a purple WAGN livery at Stevenage, albeit with FCC decals.

The front of class 313/1, no. 313110 at Kew Gardens.

A Class 313 at South Hampstead railway station in the Network SouthEast era

Notes

1. Diagram EA204 0B additionally describes a variant of the DMSO car with a steel body, instead of aluminium.^[5]
2. Removed on 313/2 units.^[4]