British Rail Class 25

British Rail Class 25
Class 25 locomotive stands on Springs Branch Traction Maintenance Depot at Wigan
Type and origin Power type Diesel-electric Builder British Railways’ Crewe Works, Darlington Works and Derby Works; Beyer, Peacock & Co. Build date 1961–1967 Total produced 327
Specifications Configuration: ​  • Whyte Bo-Bo  • UIC Bo'Bo' Gauge 4 ft 8 ^1⁄2 in (1,435 mm) standard gauge Wheel diameter 3 ft 9 in (1.143 m) Minimum curve 4.5 chains (91 m) Wheelbase 36 ft 6 in (11.125 m) Length 50 ft 6 in (15.392 m) Width 9 ft 1 in (2.769 m) Height 12 ft 8 in (3.861 m) Loco weight 71 long tons (72.1 t) to 76 long tons (77.2 t) Fuel capacity 500 imp gal (2,300 L; 600 US gal) Prime mover Sulzer 6LDA28-B Transmission DC generator, DC traction motors MU working ★ Blue Star Train heating Steam generator Train brakes Vacuum
Performance figures Top speed 90 mph (145 km/h) Power output Engine: 1,250 hp (932 kW) Tractive effort Maximum: 39,000 lbf (173,000 N) to 45,000 lbf (200,000 N) Brakeforce 38 long tons-force (380 kN)
Career Railroad(s) British Railways Number D5151–D5299, D7500–D7677; later 25001–25327 Nicknames Rats Axle load class Route availability 4

The British Rail Class 25 diesel locomotives were originally known as British Railways Type 2. They were nicknamed Rats. 327 locomotives of this type were built between 1961 and 1967.