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SR Class 4Sub

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(Redirected from British Rail Class 405)
Southern Railway 4-SUB
British Rail Class 405
4101 (prototype) in 1941
In service1941-1983
ManufacturerEastleigh Works
Number built185 units
Number preserved1 unit
Capacity368 - 386 Seats
Depot(s)Wimbledon Traincare Depot (London)
Car length
  • DMBSO: 62 ft 6 in (19.05 m)
  • TS & TSO: 62 ft (18.90 m)
Width9 ft (2.74 m)
Maximum speed75 mph (121 km/h)
Weight134 long tons (136 t; 150 short tons)
Traction motorsFour
Power output
  • Early units: 4 x 275 hp (205 kW)
    total 1,100 hp (820 kW)
  • Later units: 4 x 250 hp (190 kW)
    total 1,000 hp (750 kW)
Current collection methodContact shoe
Braking system(s)Air (Westinghouse)

The Southern Railway (SR) gave the designation Sub to the wide variety of electric multiple units that were used on inner-suburban workings in the South London area. Originally these units were formed as three-car units, but in the 1940s, all surviving units were increased to four cars by the addition of an 'Augmentation' trailer. New four-car units were also built at this time, and these survived in passenger use until late 1983, by which time British Rail had allocated to them TOPS Class 405.