|British Rail Class 455|
|Number built||137 trainsets|
|Formation||4 cars per trainset|
|Operator(s)||South West Trains|
|Maximum speed||75 mph (121 km/h)|
|Weight||DTSO - 29.5 tonnes|
|Braking system(s)||Air (Westcode)|
The British Rail Class 455 is a type of electric multiple unit drawing power from a 750 V DC third rail. Built by BREL at York works in the early and mid-1980s, they were initially categorised as Class 510 as the successor to the Class 508. They are used on suburban services in South London, by South West Trains and Southern.