British Rail Class 24

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British Railways Type 2
British Rail Class 24
Motherwell Depot and 24065.jpg
Class 24, no. 24065 at Motherwell depot, May 1976
Type and origin
Power type Diesel-electric
Builder British RailwaysDerby Works, Darlington Works and Crewe Works
Build date 1958–1961
Total produced 151
Specifications
Configuration:
 • UIC Bo'Bo'
 • Commonwealth 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 (11.13 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)
Loco weight Class 24/0: 79 long tons (80.3 t; 88.5 short tons)
Class 24/1: 73 long tons (74.2 t; 81.8 short tons)
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 DC
Traction motors BTH 137BY, DC, 4 off
Transmission Diesel electric
MU working Blue Star
Train heating Steam generator
Train brakes Vacuum
Performance figures
Maximum 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)
Brakeforce 38 long tons-force (380 kN)
Career
Operators British Railways
Numbers 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, originally known as the British Railways 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 locomotives were part of the 1955 British Rail modernisation plan. This class was used as the basis for the more powerful Class 25 locomotives.

The final survivor, no. 24081, was withdrawn from Crewe depot in 1980.