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 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
Type and origin
Power typeDiesel-mechanical
BuilderHudswell Clarke
Serial numberD898–D902, D938–D942
Build date1955–1956
Specifications
Configuration:
​
 • Whyte0-6-0 DM
 • UICC
Gauge4 ft 8 1⁄2 in (1,435 mm) standard gauge
Wheel diameter3 ft 6 in (1.067 m)
Loco weight36.35 long tons (36.93 t; 40.71 short tons)
Prime moverGardner 8L3
TransmissionMechanical, SSS Powerflow three-speed gearbox
MU workingNot fitted
Train heatingNone
Train brakesNone
Performance figures
Maximum speed14 mph (23 km/h)
Power outputEngine: 204 bhp (152 kW)
Tractive effort16,100 lbf (71.6 kN)
Career
OperatorsBritish Railways
ClassD2/7; later 2/14; no TOPS class
Numbers11116–11120, 11144–11148; D2500–D2509 from 1958 to 1962
Axle load classRoute availability 4
Retired1967
DispositionAll 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.

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
  1. Durham Mining Museum - Colliery Engineering
  2. http://www.invertrain.co.uk/detail.php?item=2817
  3. http://www.modelrailways.tv/

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