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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 built by Hudswell Clarke with a Gardner engine. The mechanical transmission, using a scoop control fluid coupling and three-speed Power-flow SSS (synchro-self-shifting) gearbox,[1] was a Hudswell Clarke speciality.

British Rail Class D2/7
Locomotive shown in 2005.
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) standard gauge Wheel diameter 3 ft 6 in (1.067 m) Loco weight 36.35 long tons (36.93 t; 40.71 short tons) Prime mover Gardner 8L3 Transmission Mechanical, SSS Powerflow three-speed gearbox MU working Not fitted Train heating None Train brakes None
Performance figures Maximum speed 14 mph (23 km/h) Power output Engine: 204 bhp (152 kW) Tractive effort 16,100 lbf (71.6 kN)
Career Operators British Railways Class D2/7; later 2/14; no TOPS class Numbers 11116–11120, 11144–11148; D2500–D2509 from 1958 to 1962 Axle load class Route availability 4 Retired 1967 Disposition All scrapped

Appearance

The D2/7 was of old-fashioned appearance with a full-height engine casing and a small, steam locomotive-type chimney. The later British Rail Class D2/12, although mechanically similar, was of more modern appearance.

Preservation

One locomotive was originally preserved after withdrawal but was then scrapped in C F Booths, Rotherham in 2005.

Modelling

A kit is available from Invertrain [2] in 7 mm Scale (O Gauge)

Mercian Models [3] make kits for this locomotive and the very similar industrial version, in both 4 mm and 7 mm scale.

See also

• List of British Rail classes

References

Sources

• Ian Allan ABC of British Railways Locomotives, winter 1962/3 edition, page 199

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