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British Rail Class 74 information


British Rail Class 74
74003 in BR blue with full yellow ends
Type and origin
Power typeElectro-diesel
BuilderBritish Railways Doncaster Works
Build date1958–1960
RebuilderCrewe Works
Rebuild date1967–1968
Number rebuilt10
Specifications
Configuration:
​
 • AARB-B[1]
 • UICBo′Bo′
 • CommonwealthBo-Bo
Gauge4 ft 8+1⁄2 in (1,435 mm) standard gauge
Wheel diameter4 ft 0 in (1.22 m)[1]
Minimum curve264 ft 0 in (80.47 m)[1]
Wheelbase
  • Each bogie:
    10 ft 6 in (3.20 m)
  • Over bogie centres:
    27 ft 0 in (8.23 m)[1]
LengthOver extended buffers:[1]
50 ft 5+1⁄2 in (15.38 m)
Width8 ft 11 in (2.72 m)[1]
Height13 ft 0+1⁄2 in (3.98 m)[1]
Loco weight77 long tons (78 t; 86 short tons)
Fuel capacity280 imp gal (1,300 L)[1]
Electric system/s650–750 V DC third rail
Current pickup(s)Contact shoe
Prime moverPaxman 6YJXL[1]
Engine type6-cylinder, 4-stroke[1]
GeneratorEnglish Electric EE843[1]
Traction motors4 × English Electric EE532A[1] ​
 • Continuous3000 A total[1]
MU working★ Blue Star
Train heatingElectric Train Heating (400 A max.)
Train brakes
  • Air
  • Vacuum
Performance figures
Maximum speed90 mph (140 km/h)
Power output
  • Electric (continuous):
    2,300 hp (1,715 kW)
  • Electric (one-hour):
    2,552 hp (1,903 kW)
  • Engine:
    650 bhp (485 kW)[1]
Tractive effort
  • On electric supply:
    47,500 lbf (211.3 kN)
  • On diesel engine:
    40,000 lbf (177.9 kN)[1]
Career
OperatorsBritish Railways
Number in class10
NumbersE6101–E6110; later 74001–74010
Axle load classRoute Availability 7
LocaleBR Southern Region
Withdrawn1976–1977
DispositionAll scrapped

The 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 catenary or (in this case) an energised third rail, or from an onboard diesel engine. All were withdrawn between June 1976 and December 1977, and scrapped between 1977 and 1981.[2]

  1. ^ a b c d e f g h i j k l m n o Vehicle Diagram Book No. 110 for Electric Locomotives (PDF). Derby: British Railways Board. May 1975. 74-a (in work p. 5). Archived (PDF) from the original on 25 November 2020 – via Barrowmore MRG.
  2. ^ Marsden, Colin J. (November 1984). BR Locomotive Numbering. Shepperton: Ian Allan Publishing. pp. 284–5. ISBN 0-7110-1445-0. EX/1184.

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