British Rail Class 24

Specifications
Specifications
Configuration:;
• UIC	Bo′Bo′
• Commonwealth	Bo-Bo
Gauge	4 ft 8+1⁄2 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)
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	4 × BTH 137BY, DC
Transmission	Diesel electric
MU working	★ Blue Star
Train heating	Steam
Train brakes	Vacuum

Type and origin
Type and origin
Power type	Diesel-electric
Builder	British Railways Derby Works, Darlington Works and Crewe Works
Build date	1958–1961
Total produced	151

British Railways Type 2
British Rail Class 24
British Railways Type 2; British Rail Class 24
	A BR Blue Class 24 at Walsall in August 1975.
Power type
Type and origin
Power type	Diesel-electric
Builder	British Railways Derby Works, Darlington Works and Crewe Works
Build date	1958–1961
Total produced	151
Configuration:;
Specifications
Configuration:;
• UIC	Bo′Bo′
• Commonwealth	Bo-Bo
Gauge	4 ft 8+1⁄2 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)
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	4 × BTH 137BY, DC
Transmission	Diesel electric
MU working	★ Blue Star
Train heating	Steam
Train brakes	Vacuum
Maximum speed
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)
Operators
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
Disposition	Four preserved, remainder scrapped

The British Rail Class 24 diesel locomotives, originally known as the Sulzer Type 2, were built from 1958 to 1961. 151 were built at Derby, Crewe and Darlington, the first twenty of them as part of the British Railways 1955 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.