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 typeDiesel-electric
BuilderBritish RailwaysCrewe Works, Darlington Works and Derby Works; Beyer, Peacock & Co.
Build date1961–1967
Total produced327
 • WhyteBo-Bo
 • UICBo'Bo'
Gauge4 ft 8 12 in (1,435 mm) standard gauge
Wheel diameter3 ft 9 in (1.143 m)
Minimum curve4.5 chains (91 m)
Wheelbase36 ft 6 in (11.125 m)
Length50 ft 6 in (15.392 m)
Width9 ft 1 in (2.769 m)
Height12 ft 8 in (3.861 m)
Loco weight71 long tons (72.1 t) to 76 long tons (77.2 t)
Fuel capacity500 imp gal (2,300 l; 600 US gal)
Prime moverSulzer 6LDA28-B
TransmissionDC generator, DC traction motors
MU working Blue Star
Train heatingSteam generator
Train brakesVacuum
Performance figures
Top speed90 mph (145 km/h)
Power outputEngine: 1,250 hp (932 kW)
Tractive effortMaximum: 39,000 lbf (173,000 N) to 45,000 lbf (200,000 N)
Brakeforce38 long tons-force (380 kN)
Railroad(s)British Railways
NumberD5151–D5299, D7500–D7677; later 25001–25327
Axle load classRoute 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.