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British Rail Class D2/7

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British Rail Class D2/7
Type and origin
Power typeDiesel-mechanical
BuilderHudswell Clarke
Serial numberD898–D902, D938–D942
Build date1955–1956
 • Whyte0-6-0 DM
Gauge4 ft 8 12 in (1,435 mm)
Wheel diameter3 ft 6 in (1.067 m)
Loco weight36.35 long tons (36.93 t)
Prime moverGardner 8L3
TransmissionMechanical, SSS Powerflow three-speed gearbox
MU workingNot fitted
Train heatingNone
Train brakesNone
Performance figures
Top speed14 mph (23 km/h)
Power outputEngine: 204 bhp (152 kW)
Tractive effort16,100 lbf (71.6 kN)
Railroad(s)British Railways
ClassD2/7; later 2/14; no TOPS class
Number11116–11120, 11144–11148; D2500–D2509 from 1958 to 1962
Axle load classRoute availability 4
DispositionAll scrapped

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.[1] This type of gearbox was a Hudswell Clarke speciality.

External photographs[2]


[change | change source]
  1. "Durham Mining Museum - Colliery Engineering". Archived from the original on 2007-09-28. Retrieved 2009-01-13.
  2. "D2500". December 2017.