SR Class 4Sub
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.
| 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 |
| Operator(s) | |
| Depot(s) | 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 collection method | Contact shoe |
| Braking system(s) | Air (Westinghouse) |
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