British Rail Class 201

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British Rail Class 201
In service 1957–1986
Manufacturer Eastleigh and Ashford Works
Number built unknown
Formation Unknown
Operator(s) British Rail
Maximum speed 75 mph (121 km/h)
Weight 55 long tons (56 t)
Prime mover(s) English Electric 4-cylinder type 4SRKT Mark II
Power output 500 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 and Ashford. They were built for use on the London-Hastings line. Several tunnels along the route had restricted clearance, meaning that these units were built with a narrow body profile.