British Rail Class D3/7

British Rail Class D3/7
LMS No. 7080 (from The Engineer, 19 Jan. 1940)
Type and origin Power type Diesel-electric Builder LMS Derby Works (mechanical) English Electric Rugby (engine) English Electric Bradford (electrical) Order number LMS Lots 141 and 156[1][page needed] Build date 1939–1942[2] Total produced 40[2]
Specifications Configuration: ​  • Whyte 0-6-0DE  • UIC C Gauge 4 ft 8+1⁄2 in (1,435 mm) Wheel diameter 4 ft 3 in (1.30 m) Wheelbase 15 ft 3 in (4.65 m) Length 31 ft 4.5 in (9.563 m) Loco weight 7080–7099: 55.25 long tons (56.14 t), 7100–7119: 53.50 long tons (54.36 t)[3] Fuel capacity 586 gallons main, 75-gallon service tank Prime mover English Electric diesel 6-cylinder, 4-stroke Traction motors English Electric, 1 off
Performance figures Maximum speed 20 mph (32 km/h) Power output Engine: 350 bhp (260 kW) @ 680 rpm Tractive effort 35,000 lbf (160,000 N)
Career Operators London, Midland and Scottish Railway, British Railways Class LMS: 0F, BR: D3/7; later 3/8 and 3/8B Numbers LMS:7080–7119;[2] BR: 12003–12032[2] Axle load class 7080–7099: RA 7, 7110–7119: RA 6 [citation needed] Withdrawn 1964(1), 1966–1967[2] Disposition 2 Preserved (7103 & 7106)
Source : The Engineer, 14 July 1939, except where noted

The British Railways Class D3/7 is a class of 0-6-0 diesel electric shunting locomotives built as LMS Nos. 7080–7119. The class were built from May 1939 through to July 1942 by the London, Midland and Scottish Railway at their Derby Works using a diesel electric transmission supplied by English Electric.

They are a modified version of the 1934-vintage Class D3/6 (LMS 7069-7079) diesel shunters based on the English Electric 6K diesel engine of 350 horsepower (260 kW), but have jackshaft transmission necessitating a significant increase in body length. The D3/6 had two axle-hung traction motors instead, and this feature became commonplace in more modern designs built after World War II.