British Rail Class 31

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Brush Type 2
British Rail Class 31
31289 at the Northampton & Lamport Railway, 22 April 2007
Power type Diesel-electric
Builder Brush Traction
Build date 1957–1962
Configuration A1A-A1A
UIC classification (A1A)'(A1A)'
Gauge ft 8+12 in (1,435 mmstandard gauge
Wheel diameter Driving: 3 ft 7 in (1.092 m)
Idling: 3 ft 3 12 in (1.003 m)
Minimum curve 4.5 chains (91 m)
Wheelbase 42 ft 10 in (13.06 m)
Length 56 ft 9 in (17.30 m)
Width 8 ft 9 in (2.67 m)
Height 12 ft 7 in (3.84 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 long tons-force (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.