British Rail Class 311

The British Rail Class 311 alternating current (AC) electric multiple units (EMU) were built by Cravens at Sheffield from 1966 to 1967. They were intended for use on the line from Glasgow Central to Gourock and Wemyss Bay, which was electrified in 1967.

British Rail Class 311
311092 at Glasgow Central in 1984
In service1967–1990
ManufacturerCravens
Order no.
  • 30767 (DTSO)
  • 30768 (MBSO)
  • 30769 (BDTSO)
Built atSheffield
Family nameBR First Generation (Mark 1)
Constructed1966–67
Entered service1967
Number built19
Number preserved1
Number scrapped18
SuccessorClass 320
Formation
  • 3 cars per unit:
  • DTSO-MBSO-BDTSO
Diagram
  • ED211 (MBS)
  • EE214 (DTS)
  • EF212 (BDTS)
Design codeAM11
Fleet numbers
  • 311092–311110 (units)
  • 76403-76421 (DTSO)
  • 62163-62181 (MBSO)
  • 76422-76440 (BDTSO)
Capacity
  • 236 seats (total)
  • 83 seats (DTSO)
  • 70 seats (MBSO)
  • 83 seats (BDTSO)
OperatorsBritish Rail
DepotsGlasgow Shields Road
Specifications
Car body constructionSteel
Train length199 ft 6 in (60.81 m)
Car length
  • 63 ft 6+1⁄8 in (19.358 m) (MBSO)
  • 64 ft 0 in (19.498 m) (BDTSO, DTSO)
Width9 ft 3 in (2.819 m)
Height12 ft 8 in (3.861 m)
DoorsDouble sliding leaf, pneumatic
Wheelbase46 ft 6 in (14.173 m)
Maximum speed75 mph (121 km/h)
Weight
  • 129 tonnes (127 long tons; 142 short tons) (total)
  • 34.4 t (33.9 long tons; 37.9 short tons) (DTSO)
  • 56.4 t (55.5 long tons; 62.2 short tons) (MBSO)
  • 38.4 t (37.8 long tons; 42.3 short tons) (BDTSO)
Traction motors4 × AEI 221 hp (165 kW)
Power output890 hp (660 kW)
HVACElectric
Electric system(s)25 kV 50 Hz AC OHLE
Current collector(s)Pantograph
UIC classification2′2′+Bo′Bo′+2′2′
Bogies
  • Gresley ED11 (MBSO)
  • Gresley ET11 (BDTSO, DTSO)
Braking system(s)Air (Auto/EP)
Safety system(s)AWS
Coupling systemBuckeye
Multiple workingWithin class, and Class 303
Track gauge1,435 mm (4 ft 8+1⁄2 in) standard gauge
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