| British Rail Mark 4 | |
|---|---|
 Virgin Trains East Coast Mark 4 carriages at London King's Cross | |
 The interior of Standard Class aboard a Virgin Trains East Coast refurbished Mark 4 TSO vehicle | |
| In service | 1989 - present |
| Manufacturer | Metro-Cammell |
| Built at | Washwood Heath, Birmingham |
| Constructed | 1989 - 1992 |
| Number built | 314 |
| Number in service | 144 |
| Number scrapped | 19 |
| Formation | 9 (or 5) carriage sets |
| Operators | London North Eastern Railway Transport for Wales |
| Lines served | East Coast Main Line |
| Specifications | |
| Car body construction | Fully integral, steel monocoque |
| Car length | 23 m (75 ft 6 in) over buffers (23.4 m (76 ft 9 in) over couplings) |
| Width | 2.73 m (8 ft 11 in) (over body) |
| Height | 3.79 m (12 ft 5 in) (rail to roof) |
| Doors | Hinged plug, pneumatically operated |
| Maximum speed | 140 mph (225 km/h) |
| Weight | 39.9–43.5 tonnes (39–43 long tons; 44–48 short tons) |
| Bogies | SIG BT41A[1] |
| Braking system(s) | Triple axle mounted discs, pneumatically operated |
| Track gauge | 1,435 mm (4 ft 8+1⁄2 in) standard gauge |
The British Rail Mark 4 is a class of passenger carriages built for use in InterCity 225 sets on the East Coast Main Line between King's Cross, Leeds and Edinburgh. Withdrawals began in 2019, with some being sold for further use with Transport for Wales between Cardiff and Holyhead.
- ^ "New bogie for German ICE (Intercity Express) based on BT41", C. Freitag and S. Karch, SIG Swiss Industrial Company, Proceedings of the Institute of Mechanical Engineers, Vol 208, 1994.