British Rail Class D3/6

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British Rail Class D3/6
Type and origin
Power type Diesel-electric
Builder English Electric at Hawthorn Leslie
Serial number HL: 3841–3850, 3816
Build date 1934 (1), 1935 (10)
 • Whyte 0-6-0 DE
 • UIC C
Gauge 4 ft 8 12 in (1,435 mm) standard gauge
Wheel diameter 4 ft 0 12 in (1.232 m)
Loco weight 51.45 long tons (52.28 t)
Prime mover English Electric 6K
Traction motors English Electric, 2 off
MU working Not fitted
Train heating None
Performance figures
Top speed 30 mph (48 km/h)
Power output Engine: 350 hp (261 kW)
Tractive effort 30,000 lbf (133.4 kN)
Railroad(s) London, Midland and Scottish Railway,
War Department,
British Railways
Class LMS: 0F; BR: D3/6
Number LMS 7069–7079;
BR 12000–12002
Axle load class Route availability 5

Class D3/6 were diesel shunters built in 1935 by English Electric for the London, Midland and Scottish Railway. They were the first of a new design of diesel shunters based on the English Electric 6K of 350 hp diesel engine. One demonstrator and ten production locomotives were built, numbered 7079 and 7069-7078 by the LMS. Three of these later became British Rail numbers 12000–12002 (previously 7074/76/79 respectively). The remainder were sold to the British War Department in 1940 and were shipped to France during World War II. Of these the first production locomotive, no. 7069, survived the war and was used in industrial service in France. It was later repatriated for preservation and is now based at the Gloucestershire Warwickshire Railway.