British Rail Mark 3

British Rail Mark 3
Virgin Trains East Coast Trailer Standard No. 42210 at York
The interior of Standard Class aboard an LNER refurbished Mark 3 TS vehicle
In service	1975–present
Manufacturer	British Rail Engineering Limited
Built at	Derby Litchurch Lane Works
Constructed	1975-1988
Number built	848
Number scrapped	300[needs update][1]
Capacity	As originally built (typical): First class: 48 Standard class: 74
Operators	Chiltern Railways Great Western Railway Network Rail ScotRail The Royal Scotsman Royal Train
Lines served	Great Western Main Line Chiltern Main Line Highland Main Line Glasgow to Aberdeen Line Edinburgh to Aberdeen Line
Specifications
Car body construction	Steel fully integral, monocoque
Car length	23.0 m (75 ft 6 in)[2]
Doors	Hinged slam, centrally locked/automatic sliding doors, centrally locked
Maximum speed	125 mph (200 km/h)
Power supply	3-phase 415/240 V (Mark 3) 1,000 V DC (Mark 3A/B)
Bogies	BREL BT10
Braking system(s)	Disc, air operated
Track gauge	1,435 mm (4 ft 8+1⁄2 in) standard gauge

The British Rail Mark 3 is a type of passenger carriage developed in response to growing competition from airlines and the car in the 1970s. A variant of the Mark 3 became the rolling stock for the High Speed Train (HST).

Originally conceived as locomotive-hauled coaching stock, the first coaches built were for the prototype HST in 1972. Production coaches entered service between 1975 and 1988, and multiple-unit designs based on the Mark 3 bodyshell continued to be built until the early 1990s. Most of the surviving fleet of the Mark 3 and its derivatives were still in revenue service on the British railway network in 2020, however, as of 7 April 2021, 300 carriages have been sent for scrap.^[1]