British Rail Class 81
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| British Railways AL1 British Rail Class 81 |
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| A row of Class 81 locomotives waiting to be scrapped | |
| Power type | Electric |
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| Builder | Associated Electrical Industries at Birmingham Railway Carriage and Wagon Company |
| Build date | 1959–1964 |
| Total production | 25 |
| Configuration | Bo-Bo |
| UIC classification | Bo'Bo' |
| Gauge | 4 ft 81⁄2 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 1⁄2 in (2.65 m) |
| Height | 12 ft 4 1⁄4 in (3.77 m) |
| Locomotive weight | 79.60 long tons (80.9 t) |
| Electric system(s) | 25 kV AC |
| Current collection method | Stone-Faiverley ‘V’-type pantograph, 2 off (later 1 off) |
| Traction motors | 847 hp (632 kW) AEI 189 quill drive, 4 off |
| Top speed | 100 mph (161 km/h) |
| Power output | 3,200 hp (2,390 kW) |
| Tractive effort | 50,000 lbf (222 kN) |
| Train heating | Electric Train Heating |
| Locomotive brakes | Air, Rheostatic |
| Train brakes | Vacuum; Dual from 1972–1973 |
| Career | 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.
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