British Rail Class D3/12

Southern Railway diesels 1–3 British Rail Class D3/12
Type and origin Power type Diesel-electric Builder Southern Railway’s Ashford Works Build date 1937 Total produced 3
Specifications Configuration: ​  • Whyte 0-6-0 DE  • UIC C Gauge 4 ft 8 1⁄2 in (1,435 mm) Wheel diameter 4 ft 6 in (1.372 m) Loco weight 55.25 long tons (56.14 t) Prime mover English Electric 6K Traction motors English Electric, 2 off MU working Not fitted Train heating None
Performance figures Top speed 25 mph (40 km/h) Power output Engine: 350 bhp (260 kW) Tractive effort 30,000 lbf (133.4 kN)
Career Railroad(s) 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 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.