British Rail Class 81

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British Railways AL1
British Rail Class 81
Class81.jpg
A row of Class 81 locomotives waiting to be scrapped
Type and origin
Power type Electric
Builder Associated Electrical Industries at Birmingham Railway Carriage and Wagon Company
Build date 1959–1964
Total produced 25
Specifications
Configuration:
 • Whyte Bo-Bo
 • UIC Bo'Bo'
Gauge 4 ft 8 12 in (1,435 mm) standard gauge
Wheel diameter 4 ft 0 in (1.219 m)
Length 56 ft 6 in (17.22 m)
Width 8 ft 8 12 in (2.65 m)
Height 12 ft 4 14 in (3.77 m)
Loco weight 79.60 long tons (80.9 t)
Electric system/s 25 kV AC
Current pickup(s) Stone-Faiverley ‘V’-type pantograph, 2 off (later 1 off)
Traction motors 847 hp (632 kW) AEI 189 quill drive, 4 off
Train heating Electric Train Heating
Loco brake Air, Rheostatic
Train brakes Vacuum; Dual from 1972–1973
Performance figures
Top speed 100 mph (161 km/h)
Power output 3,200 hp (2,390 kW)
Tractive effort 50,000 lbf (222 kN)
Career
Railroad(s) British Rail
Number E3001–E3023, E3096, E3097; later 81001–81022
Axle load class Route availability 6
Retired 1968 (2), 1971 (1), 1983–1991
Disposition One preserved, remainder scrapped

The British Rail Class 81 is an AC electric locomotive that formerly operated on the West Coast Main Line of the London Midland Region of British Rail.