British Rail Class 25

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.

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