Sleeper Composite

Infobox DMU
name = British Rail Sleeper Composite

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imagesize = 300px
background = #0033cc
caption = A composite SLC sleeping car in the LNWR carriage sheds at Crewe in the mid-1970s
Manufacturer = BR Wolverton & Metro Cammell
Operator = British Rail
Formation =
Built =
LinesServed =
InService = 1957-
CarLength = 64ft 6in
CarWidth = 9ft 3in
CarHeight = 12ft 9 1/2in
Weight = 40 tons
Capacity =
MaxSpeed = 100mph
Gauge =
Traction =
Engine = |

A Composite Sleeper or SLC, is a type of railway sleeping carriage with fixed bunks used by British Railways (BR) between the late 1950s and early 1980s.

Built in 1957 the BR Mark 1 composite SLC sleeping cars had 11 compartments with a side corridor, two toilets at one end and an attendant's pantry at the other. The second class compartments had two bunks, the upper one folded down when required, and the first class compartment had a single bunk.

They were built on the standard Mk1 coach 63' underframe and weighed approximately 40 tonnes.

There were no sleeping cars in the British Rail Mark 2 coach fleet, and the Mark 1 cars were used for well over 20 years until they were superseded by the Mark 3 sleepers after 1979.