The reference for locomotives and railcars
British Rail class 25 (Sulzer type 2)
Great Britain | 1961 | 327 produced
25120 in the late 1970's in Kenton
25120 in the late 1970's in Kenton
Barry Lewis / Half Frame At Kenton - 3

When it was noticed that the 75 mph (121 km/h) class 24 was too slow for many tasks, the 90 mph (145 km/h) class 25 was born. Thanks to an intercooler, the engine now produced 90 hp more. Several manufacturers delivered a total of 327 locomotives of subclasses 25/0 to 25/3, which mainly differed in terms of the electrics. They mainly hauled freight trains, but some locomotives had steam heating for passenger trains. They were called “Rats” because of their widespread use. Regular use ended in 1987. In 1983, three locomotives had been converted into electric train heaters, which were carried on trains and scrapped in 1994. Today a total of 20 class 25 units are being preserved.

ManufacturerCrewe, Darlington, Derby, Beyer, Peacock & Co.
Axle configB-B 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length50 ft 6 in
Wheelbase36 ft 6 in
Service weight163,583 lbs
Adhesive weight163,583 lbs
Axle load41,006 lbs
Power sourcediesel-electric
Top speed90 mph
Starting effort39,000 lbf
EngineSulzer 6LDA28-B
Engine type6-cyl. diesel
Fuel601 us gal (diesel)
Engine output1,250 hp (932 kW)
Power Plant
Calculated Values
diesel locomotive
last changed: 06/2023

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