British Rail Class 24

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British Railways Type 2
British Rail Class 24
Power type Diesel-elctric
Builder British RailwaysDerby Works, Darlington Works and Crewe Works
Build date 1958–1961
Total production 151
Configuration Bo-Bo
UIC classification Bo'Bo'
Gauge ft 8+12 in (1,435 mmstandard gauge
Wheel diameter 3 ft 9 in (1.143 m)
Minimum curve 4.5 chains (91 m)
Wheelbase 36 ft 6 in (11.13 m)
Length 50 ft 6 in (15.39 m)
Width 8 ft 10 in (2.69 m)
Height 12 ft 8 in (3.86 m)
Locomotive weight Class 24/0: 79 long tons (80.3 t)
Class 24/1: 73 long tons (74.2 t)
Fuel capacity Class 24/0: 546 imp gal (2,480 l; 656 US gal)
Class 24/1: 500 imp gal (2,300 l; 600 US gal)
Prime mover Sulzer 6LDA28
Generator BTH RTB15656
Traction motors BTH 137BY, 4 off
Transmission DC generator, DC traction motors
Multiple working Blue Star
Top speed 75 mph (121 km/h)
Power output Engine: 1,160 hp (865 kW)
At rail: 843 hp (629 kW)
Tractive effort Maximum: 42,000 lbf (186.8 kN)
Continuous: 21,300 lbf (94.7 kN)
Train heating Steam
Locomotive brakeforce 38 long tons-force (380 kN)
Train brakes Vacuum
Career British Railways
Number D5000–D5150; later 24001–24047, 24051–24141
Axle load class Class 24/0: RA 7 (6 from 1969)
Class 24/1: RA 6 (5 from 1959)
Retired 1967–1980
Preserved Four (list)

The British Rail Class 24 diesel locomotives, also known as the Sulzer Type 2, were built from 1958 to 1961. One hundred and fifty-one of these locomotives were built at Derby, Crewe and Darlington, the first twenty of them as part of the 1955 British Rail modernisation plan. This class was used as the basis for the development of the Class 25 locomotives.

The final survivor, no. 24081, was withdrawn from Crewe depot in 1980.