British Rail Class 25

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British Rail Class 25
Class 25 diesel-electric.jpg
Class 25 locomotive stands on Springs Branch Traction Maintenance Depot at Wigan
Type and origin
Power type Diesel-electric
Builder British RailwaysCrewe 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 12 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.