British Rail Class 45

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Derby Type 4
British Rail Class 45
D123 Great Central Railway (1).jpg
Class 45 number D123
Type and origin
Power typeDiesel-electric
BuilderBritish RailwaysDerby Works and Crewe Works
Build date1960–1962
Total produced127
Specifications
Configuration:
 • Whyte1Co-Co1
 • UIC(1Co)'(Co1)'
Wheel diameter3 ft 9 in (1.143 m)
Minimum curve5 chains (100 m)
Wheelbase59 ft 8 in (18.19 m)
Length67 ft 11 in (20.70 m)
Width8 ft 10 12 in (2.71 m)
Height12 ft 10 in (3.91 m)
Loco weight133 long tons (135 t)
Fuel capacity840 imp gal (3,800 l; 1,010 US gal)
Prime moverSulzer 12LDA28-B
MU working Blue Star
Train heating45/0: Steam generator
45/1: Electric Train Heat
Train brakesVacuum
Performance figures
Top speed90 mph (145 km/h)
Power outputEngine: 2,500 bhp (1,864 kW)
At rail: 2,000 hp (1,491 kW)
Tractive effortMaximum: 55,000 lbf (245 kN)
Brakeforce63 long tons-force (628 kN)
Career
Railroad(s)British Railways
NumberD11–D137; later 45001–45077, 45101–45150
Nicknames'Peak'
Axle load classRoute availability 7

The British Rail Class 45 also known as the Sulzer Type 4 diesel locomotives were built by British Rail at their Derby and Crewe Works between 1960 and 1962. They were the successors to the Class 44 locomotives. When initially put into service the locomotives were fitted with multi-unit working and steam heating boilers for passenger service. In the early 1970s fifty were fitted with electric train supply in place of their steam heating boilers, and assigned to work services on the Midland Main Line from London St Pancras to Nottingham, Derby and Sheffield. All were withdrawn from service by 1989.