| British Rail DBSO | |
|---|---|
 Anglia Railways' DBSO 9701, at Colchester station in June 2003 | |
| In service | 1979–present |
| Manufacturer | |
| Family name | British Rail Mark 2 |
| Number built | 14 rebuilt |
| Number preserved | 3 |
| Number scrapped | 2 |
| Fleet numbers | 9701–9714 |
| Operators | |
| Specifications | |
| Car length | 66 ft 0 in (20.12 m) |
| Width | 9 ft 3 in (2.82 m) |
| Height | 12 ft 9+1⁄2 in (3.899 m) |
| Maximum speed | 100 mph (160 km/h) |
| Weight | 33 long tons (33.5 t; 37.0 short tons) |
| Braking system(s) | Air |
| Track gauge | 1,435 mm (4 ft 8+1⁄2 in) |
A Driving Brake Standard Open (DBSO) is a type of railway carriage in Great Britain, converted to operate as a control car; this is not to be confused with DVTs, such as those in InterCity 225 sets. Fourteen such vehicles, numbered 9701 to 9714, were converted from Mark 2F Brake Standard Open (standard class coaches with brake van) carriages. Modifications included adding a driving cab and TDM equipment to allow a locomotive to be driven remotely. Using a system known as push–pull, the driver in the DBSO can drive the locomotive, even though it is at the opposite end of the train.