British Rail Class 25 – “Rats”

The British Rail Class 25 diesel locomotives otherwise known as Sulzer type 2′s or Rats were built between 1961 and 1967. Class 24′s were built as a somewhat prototype for these locomotives. The Class 25 proving a popular locomotive, a total of 327 were built during this time.

British Rail Class 25
Power type Diesel-electric
Builder British Railways’ Crewe Works, Darlington Works and Derby Works; Beyer, Peacock & Co.
Build date 1961–1967
Total produced 327
Configuration Bo-Bo
UIC classification Bo’Bo’
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)
Locomotive 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
Traction motors D5151-D5175, four BTH traction motors
others: four AEI 253 AY traction motors
Transmission DC generator, DC traction motors
Multiple working ★ Blue Star
Top speed 90 mph (145 km/h)
Power output Engine: 1,250 hp (932 kW) @750 rpm
Tractive effort Maximum: 39,000 lbf (170 kN) to 45,000 lbf (200 kN)
Train heating Steam (when present)
Locomotive
brakeforce		 38 LTf (380 kN)
Train brakes Vacuum
Career British Railways
Number D5151–D5299, D7500–D7677; later 25001–25327
Nicknames Rats
Axle load class Route availability 4

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