SR Class 4Sub
| Southern Railway 4-SUB British Rail Class 405 | |
|---|---|
4101 (prototype) in 1941 | |
| In service | 1941-1983 |
| Manufacturer | Eastleigh Works |
| Constructed | 1941-1951 |
| Number built | 185 units |
| Number preserved | 1 unit |
| Formation | DMBSO-TS-TSO-DMBSO |
| Capacity | 368 - 386 Seats |
| Operators | |
| Depots | Wimbledon Traincare Depot (London) |
| Specifications | |
| Car length |
|
| Width | 9 ft (2.74 m) |
| Maximum speed | 75 mph (121 km/h) |
| Weight | 134 long tons (136 t; 150 short tons) |
| Traction motors | Four |
| Power output |
|
| Current collector(s) | Contact shoe |
| Braking system(s) | Air (Westinghouse) |
The Southern Railway (SR) and the British Railways (Southern Region) (BR(S)) used the designation Sub to cover a wide variety of electric multiple-unit passenger trains that were used on inner-suburban workings in the South London area. The designation 'Sub' was first officially used in 1941 to refer to newly built 4-car units. However, during the 1940s large numbers of earlier '3-Car Suburban Sets' were increased to four cars by the addition of an 'Augmentation' trailer, and became part of the 4-Sub category. The SR and BR (S) continued to build or else rebuild 4-car units to slightly different designs which became part of the 4-Sub Class. Many of these later examples survived in passenger use until late 1983, by which time British Rail had allocated to them TOPS Class 405.