British Rail Class D1/1

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.

British Rail Class D1/1
Type and origin
Power typeDiesel-mechanical
BuilderHunslet Engine Company
Serial number4625–4627
Build date1954–1955
Specifications
Configuration:
​
 • Whyte0-4-0dm
 • UICB
Gauge4 ft 8 1⁄2 in (1,435 mm) standard gauge
Wheel diameter3 ft 4 in (1.016 m)
Loco weight22.45 long tons (22.81 t)
Prime moverGardner 6L3
TransmissionMechanical, Hunslet four-speed gearbox
MU workingNot fitted
Train heatingNone
Train brakesNone
Performance figures
Top speed14 mph (23 km/h)
Power outputEngine: 153 bhp (114 kW)
Tractive effort10,800 lbf (48.0 kN)
Career
Railroad(s)British Railways
ClassDY1; later D1/1; later 1/15. No TOPS class.
Number11500–11502; D2950–D2952 from 1957 to 1958
Axle load classRoute availability 1
DispositionOne sold to industry, two scrapped


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