British Rail Class D3/6

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.

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)
Specifications Configuration: ​  • Whyte 0-6-0 DE  • UIC C Gauge 4 ft 8 1⁄2 in (1,435 mm) standard gauge Wheel diameter 4 ft 0+1⁄2 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)
Career 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