Mark 3 Coach

The British Rail Mark 3 is a type of passenger carriage developed in response to growing competition from airlines and the car in the 1960s. A variant of the Mark 3 became the rolling stock for the High Speed Train (HST). The Mark 3s were built by BREL. They were air-conditioned throughout, something modern that wasn't used in Mark 1s or Mark 2s.

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. The Mark 3 and its derivatives are widely recognised as a safe and reliable design, and most of the surviving fleet is still in revenue service on the British railway network in 2018.

Designations

Coad	Type	Date Built	Length	Width	Hight	Max Speed	Weight
BFO	Brake First Open
CO	Corridor Open
FO	First Open	1976 - 1985	75ft				32.5t - 36.5t
RFM	Restaurant First Modular
SLE	Sleeper Either Class	1981 - 1984	75ft			125 mph	43t
SLED	Sleep Either Class (Disabled)
SLEP	Sleeper Either Class with Pantry
TF	Trailer First	1975 - 1982
TGS	Trailer Guard Second
TRSB	Trailer Buffet
TRUB	Trailer Buffet
TRUK	Trailer Kitchen
TS	Trailer Second
TSO	Trailer Second Open
TSOB	Trailer Second Open Buffet

Multiple Units

Class	Unit Make Up	Build Date	Car Length	Car Width	Car Height	Top Speed	Car Weight
Class 150	DMSL	1984–1987	65ft 10in	9ft 2.9in	12ft 4.6in	75 mph	35.8t
	MS
	DMS
Class 950	DM
Class 210	DMBSO	1982–1987				90 mph
	TSO
	TCO(L)
	DTSO
Class 316/457	DMSO	1989/1990
	TSO
	PTSO
Class 317	DTSO	1981–82, 1985–87	65 ft 3⁄4 in	9ft 3in	12ft 1 5⁄8in	100 mph	137.6t
	MSO
	TCO
Class 318	DTSO	1985 - 1986				95 mph
	MSO
Class 319	DTSO	1987–88, 1990	65.1ft	9ft 3in	11ft 9in	100 mph	7.25 t
	DTCO						7.425 t
	MSO		65.4 ft				12.65 t
	TSOL						7.75 t
Class 320		1990			12ft 47⁄8in	90 mph or 100 mph	114.5t
Class 321	DTCO		65ft 5in		12ft 5in	100 mph	137.9t
	TSO
	MSO
	DTSO
Class 322	DTCO	1990			12ft 47⁄8in		141.8t
	TSO
	MSO
	DTSO
Class 325	DTPMV	1995 - 1996 (NOT BR Built)	65 ft 3⁄4 in				138.5t
	MPMV		65 ft 4 in
	TPMV
Class 442	DTS	1988-1989	75 ft 11.4 in	8ft 117⁄8in	12ft 6in
	TSO		75ft
	MLC
	TWS
Class 455	DTSO		65 ft 3⁄4 in	9 ft 3 in		75 mph	135.95t
	MSO
	TSO
Class 456	DMSO	1990 - 1991					72.5t
	DTSO