The British Rail Class 10 diesel locomotive was a variation on the Class 08 diesel-electric shunter in which a Blackstone diesel engine was fitted instead of one made by the English Electric company. Traction motors were by the General Electric Company plc (GEC); the class D3/5 were similar, but had British Thomson-Houston (BTH) traction motors.
The locomotives were built at the BR Works in Darlington and Doncaster over the period 1955–1962. At first they were classified D3/4, then 3/1C before becoming Class 10 under TOPS.
- Engine: Blackstone 6-cylinder, 4-stroke, ER6T
- Traction motors: 2 x GEC nose suspended motors
The class were withdrawn between February 1967 and June 1972. Four have been preserved while the remainder have been scrapped.
- D3452 is at the Bodmin and Wenford Railway
- D3489 is at the Spa Valley Railway
- D4067 is at the Great Central Railway
- D4092 is at the Barrow Hill Engine Shed
- A fifth example, D3476, was stored on the Colne Valley Railway, though has since been scrapped.
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