British Rail Class D3/12

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Southern Railway diesels 1–3
British Rail Class D3/12
Power type Diesel-electric
Builder Southern Railway’s Ashford Works
Build date 1937
Total production 3
Configuration 0-6-0 DE
UIC classification C
Gauge ft 8+12 in (1,435 mm)
Wheel diameter 4 ft 6 in (1.372 m)
Locomotive weight 55.25 long tons (56.14 t)
Prime mover English Electric 6K
Traction motors English Electric, 2 off
Multiple working Not fitted
Top speed 25 mph (40 km/h)
Power output Engine: 350 bhp (260 kW)
Tractive effort 30,000 lbf (133.4 kN)
Train heating None
Career Southern Railway,
British Railways
Class BR: D3/12; later 3/9A
Number SR: 1–3;
BR: 15201–15203
Retired 1964
Disposition All scrapped

British Rail class D3/12 was a class of three diesel electric shunting locomotives built by the Southern Railway in 1937. They were numbered 1 to 3 in a separate list from the SR's steam locomotives. They were later renumbered by British Railways 15201–15203. Twenty-six further engines of a similar design were built after nationalisation as British Rail Class 12.