British Rail Class D2/7

British Rail Class D2/7 was a locomotive commissioned by British Rail in England. It was a diesel powered locomotive in the pre-TOPS period. It was built by Hudswell Clarke with a Gardner engine. The mechanical transmission, used a scoop control fluid coupling and a three-speed Power-flow SSS (synchro-self-shifting) gearbox. This type of gearbox was a Hudswell Clarke speciality.

British Rail Class D2/7
Type and origin Power type Diesel-mechanical Builder Hudswell Clarke Serial number D898–D902, D938–D942 Build date 1955–1956
Specifications Configuration: ​  • Whyte 0-6-0 DM  • UIC C Gauge 4 ft 8 1⁄2 in (1,435 mm) Wheel diameter 3 ft 6 in (1.067 m) Loco weight 36.35 long tons (36.93 t) Prime mover Gardner 8L3 Transmission Mechanical, SSS Powerflow three-speed gearbox MU working Not fitted Train heating None Train brakes None
Performance figures Top speed 14 mph (23 km/h) Power output Engine: 204 bhp (152 kW) Tractive effort 16,100 lbf (71.6 kN)
Career Railroad(s) British Railways Class D2/7; later 2/14; no TOPS class Number 11116–11120, 11144–11148; D2500–D2509 from 1958 to 1962 Axle load class Route availability 4 Retired 1967 Disposition All scrapped

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