British Rail Class D1/1

British Rail Class D1/1
Type and origin Power type Diesel-mechanical Builder Hunslet Engine Company Serial number 4625–4627 Build date 1954–1955
Specifications Configuration: ​  • Whyte 0-4-0dm  • UIC B Gauge 4 ft 8 1⁄2 in (1,435 mm) standard gauge Wheel diameter 3 ft 4 in (1.016 m) Loco weight 22.45 long tons (22.81 t) Prime mover Gardner 6L3 Transmission Mechanical, Hunslet four-speed gearbox MU working Not fitted Train heating None Train brakes None
Performance figures Top speed 14 mph (23 km/h) Power output Engine: 153 bhp (114 kW) Tractive effort 10,800 lbf (48.0 kN)
Career Railroad(s) 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.