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British Rail Class D3/12

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Southern Railway diesels 1–3
British Rail Class D3/12
Type and origin
Power typeDiesel-electric
BuilderSouthern Railway’s Ashford Works
Build date1937
Total produced3
 • Whyte0-6-0 DE
Gauge4 ft 8 12 in (1,435 mm)
Wheel diameter4 ft 6 in (1.372 m)
Loco weight55.25 long tons (56.14 t)
Prime moverEnglish Electric 6K
Traction motorsEnglish Electric, 2 off
MU workingNot fitted
Train heatingNone
Performance figures
Top speed25 mph (40 km/h)
Power outputEngine: 350 bhp (260 kW)
Tractive effort30,000 lbf (133.4 kN)
Railroad(s)Southern Railway,
British Railways
ClassBR: D3/12; later 3/9A
NumberSR: 1–3;
BR: 15201–15203
DispositionAll scrapped

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