British Rail Class 31

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 to 1962.

Brush Type 2
British Rail Class 31
31289 at the Northampton & Lamport Railway, 22 April 2007
Type and origin
Power typeDiesel-electric
BuilderBrush Traction
Build date1957–1962
Specifications
Configuration:
​
 • WhyteA1A-A1A
 • UIC(A1A)'(A1A)'
Gauge4 ft 8 1⁄2 in (1,435 mm) standard gauge
Wheel diameterDriving: 3 ft 7 in (1.092 m)
Idling: 3 ft 3+1⁄2 in (1.003 m)
Minimum curve4.5 chains (91 m)
Wheelbase42 ft 10 in (13.06 m)
Length56 ft 9 in (17.30 m)
Width8 ft 9 in (2.67 m)
Height12 ft 7 in (3.84 m)
Loco weight106.7 long tons (108.4 t) to 113 long tons (115 t)
Fuel capacity650 imp gal (3,000 L; 780 US gal)
Prime moverOriginal: Mirrlees JVS12T
Rebuilt: English Electric 12SVT
TransmissionDC generator, DC traction motors
MU workingD5500–D5519: ● Red Circle
Remainder: ★ Blue Star
Train heating31/0 & 31/1: Steam generator
31/4: Electric Train Heat
Train brakesVacuum
Performance figures
Top speedD5500–5534: 80 mph (129 km/h)
Remainder: 90 mph (145 km/h)
Power outputEngine: 1,470 bhp (1,100 kW)
At rail: 872 hp (650 kW)
Tractive effortMaximum: 35,900 lbf (159,691 N)
Brakeforce49 long tons-force (488 kN)
Career
Railroad(s)British Railways
NumberD5500–D5699, D5800–D5862, later 31001–31970
Axle load classRoute availability 5


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