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 service1972–present
ManufacturerBritish Rail Engineering Limited
Built atDerby Litchurch Lane Works
Constructed1972-1988
Number built848
Number scrapped300
CapacityAs originally built (typical):
  • First class: 48
  • Standard class: 74
Operators
Lines served
Specifications
Car body constructionSteel
fully integral, monocoque
Car length23.0 m (75 ft 6 in)
DoorsHinged slam, centrally locked/automatic sliding doors, centrally locked
Maximum speed125 mph (200 km/h)
Power supply
  • 3-phase 415/240 V (Mark 3)
  • 1,000 V DC (Mark 3A/B)
BogiesBREL BT10
Braking systemsDisc, air operated
Track gauge1,435 mm (4 ft 8+12 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.