British Rail Class D1/1

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British Rail Class D1/1
Power type Diesel-mechanical
Builder Hunslet Engine Company
Serial number 4625–4627
Build date 1954–1955
Configuration 0-4-0dm
UIC classification B
Gauge ft 8+12 in (1,435 mmstandard gauge
Wheel diameter 3 ft 4 in (1.016 m)
Locomotive weight 22.45 long tons (22.81 t)
Prime mover Gardner 6L3
Transmission Mechanical, Hunslet four-speed gearbox
Multiple working Not fitted
Top speed 14 mph (23 km/h)
Power output Engine: 153 bhp (114 kW)
Tractive effort 10,800 lbf (48.0 kN)
Train heating None
Train brakes None
Career British Railways
Class DY1; later D1/1; later 1/15. No TOPS class.
Number 11500–11502; D2950–D2952 from 1957 to 1958
Axle load class Route availability 1
Disposition One sold to industry, two scrapped

British Rail Class D1/1 (formerly DY1) was a class of locomotive commissioned by British Rail in England. It was a diesel locomotive in the pre-TOPS period built by the Hunslet Engine Company with a 153 horsepower (114 kW) Gardner 6L3 engine.