British Rail Class 31
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| Brush Type 2 British Rail Class 31 |
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| 31289 at the Northampton & Lamport Railway, 22 April 2007 | |
| Power type | Diesel-electric |
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| Builder | Brush Traction |
| Build date | 1957–1962 |
| Configuration | A1A-A1A |
| UIC classification | (A1A)'(A1A)' |
| Gauge | 4 ft 81⁄2 in (1,435 mm) standard gauge |
| Wheel diameter | Driving: 3 ft 7 in (1.092 m) Idling: 3 ft 3½ in (1.00 m) |
| Minimum curve | 4.5 chains (91 m) |
| Wheelbase | 42 ft 10 in (13.1 m) |
| Length | 56 ft 9 in (17.3 m) |
| Width | 8 ft 9 in (2.7 m) |
| Height | 12 ft 7 in (3.8 m) |
| Locomotive weight | 106.7 long tons (108.4 t) to 113 long tons (115 t) |
| Fuel capacity | 650 imp gal (3,000 l; 780 US gal) |
| Prime mover | Original: Mirrlees JVS12T Rebuilt: English Electric 12SVT |
| Transmission | DC generator, DC traction motors |
| Multiple working | D5500–D5519: ● Red Circle Remainder: ★ Blue Star |
| Top speed | D5500–5534: 80 mph (129 km/h) Remainder: 90 mph (145 km/h) |
| Power output | Engine: 1,470 bhp (1,100 kW) At rail: 872 hp (650 kW) |
| Tractive effort | Maximum: 35,900 lbf (159,691 N) |
| Train heating | 31/0 & 31/1: Steam 31/4: Electric Train Heat |
| Locomotive brakeforce | 49 LTf (488 kN) |
| Train brakes | Vacuum |
| Career | British Railways |
| Number | D5500–D5699, D5800–D5862, later 31001–31970 |
| Axle load class | Route availability 5 |
The British Rail Class 31 diesel locomotives, also known as the Brush Type 2 and originally as Class 30, were built by Brush Traction from 1957-62.
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