British Rail Class 201

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British Rail Class 201
Set 1004 prepares to leave Cannon Street station on 14 May 1984
In service1957–1986
ManufacturerEastleigh and Ashford Works
Number builtunknown
Operator(s)British Rail
Maximum speed75 mph (121 km/h)
Weight55 long tons (56 t)
Prime mover(s)English Electric 4-cylinder type 4SRKT Mark II
Power output500 bhp (370 kW) at 850 rpm. Total 1,000 bhp per set.

The British Rail Class 201 (or 6S) six-car diesel-electric multiple units (DEMUs) were built in 1957–1958 at Eastleigh railway works and Ashford railway works. They were built for use on the London to Hastings line. Several tunnels along the route had restricted clearance, meaning that these units were built with a narrow body profile.