British Rail Class 24
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| British Railways Type 2 British Rail Class 24 |
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| Power type | Diesel-elctric |
|---|---|
| Builder | British Railways’ Derby Works, Darlington Works and Crewe Works |
| Build date | 1958–1961 |
| Total production | 151 |
| Configuration | Bo-Bo |
| UIC classification | Bo'Bo' |
| Gauge | 4 ft 81⁄2 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) |
| 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 (187 kN) Continuous: 21,300 lbf (94.7 kN) |
| Train heating | Steam |
| Locomotive brakeforce | 38 LTf (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The final survivor, no. 24081, was withdrawn from Crewe depot in 1980.
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