British Rail Class 74

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British Rail Class 74
Class 74 74003.jpg
74 003 in BR blue with full yellow ends
Type and origin
Power typeElectro-diesel
BuilderBritish RailwaysDoncaster Works; rebuilt BR Crewe Works
Build date1958–1960; Rebuilt 1967–1968
Total produced10 (rebuilt)
Specifications
Configuration:
 • WhyteBo-Bo
 • UICBo'Bo'
Gauge4 ft 8 12 in (1,435 mm)
Wheel diameter4 ft 0 in (1.219 m)
Loco weight77 long tons (78 t)
Electric system/s650–750 V Direct Current
Current pickup(s)Third rail
Prime moverPaxman 6YJXL
Traction motorsEnglish Electric 532A, 4 off
Train heatingElectric Train Heating
Train brakesVacuum, Air, Electro-Pneumatic
Performance figures
Power outputElectric (continuous): 2,300 hp (1,715 kW)
Electric (one-hour): 2,552 hp (1,903 kW)
Engine: 650 bhp (485 kW)
Tractive effortElectric: 47,500 lbf (211.3 kN)
Diesel: 40,000 lbf (177.9 kN)
Career
Railroad(s)British Railways’ Southern Region
NumberE6101–E6110
Axle load classRoute availability 7
DispositionAll scrapped

British Rail class 74 was an electro-diesel locomotive that operated on the Southern Region of British Railways, rebuilt from redundant Class 71 locomotives in the late 1960s. An electro-diesel locomotive is one that can operate either from an electrical supply, such as overhead lines or an energized third rail, or from an onboard diesel engine.