British Rail Class 31

Specifications
Specifications
Configuration:;
• UIC	(A1A)(A1A)
• Commonwealth	A1A-A1A
Gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Wheel diameter	Driving: 3 ft 7 in (1,092 mm); Idling: 3 ft 3+1⁄2 in (1,003 mm);
Minimum curve	4.5 chains (300 ft; 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)
Loco weight	106.7 long tons (108.4 t; 119.5 short tons) to 113 long tons (115 t; 127 short tons)
Fuel capacity	550 imp gal (2,500 L; 660 US gal)
Prime mover	Original: Mirrlees JVS12T; Rebuilt: English Electric 12SVT;
Generator	Brush TG160.48
Traction motors	Four Brush TM73
Transmission	Diesel electric
Train heating	31/0 & 31/1: Steam; 31/4: Electric Train Heat (Index 66)
Train brakes	Vacuum / Dual (Air/Vac)

Type and origin
Type and origin
Power type	Diesel-electric
Builder	Brush Traction
Serial number	71–90, 119–178, 180–280, 282–326, 362–398
Build date	1957–1962
Total produced	263

Brush Type 2
British Rail Class 31
Brush Type 2; British Rail Class 31
	A Class 31 at Saltley MPD, 1987
Power type
Type and origin
Power type	Diesel-electric
Builder	Brush Traction
Serial number	71–90, 119–178, 180–280, 282–326, 362–398
Build date	1957–1962
Total produced	263
Configuration:;
Specifications
Configuration:;
• UIC	(A1A)(A1A)
• Commonwealth	A1A-A1A
Gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Wheel diameter	Driving: 3 ft 7 in (1,092 mm); Idling: 3 ft 3+1⁄2 in (1,003 mm);
Minimum curve	4.5 chains (300 ft; 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)
Loco weight	106.7 long tons (108.4 t; 119.5 short tons) to 113 long tons (115 t; 127 short tons)
Fuel capacity	550 imp gal (2,500 L; 660 US gal)
Prime mover	Original: Mirrlees JVS12T; Rebuilt: English Electric 12SVT;
Generator	Brush TG160.48
Traction motors	Four Brush TM73
Transmission	Diesel electric
Train heating	31/0 & 31/1: Steam; 31/4: Electric Train Heat (Index 66)
Train brakes	Vacuum / Dual (Air/Vac)
Maximum speed
Performance figures
Maximum speed	D5500–5534: 80 mph (129 km/h); Remainder: 90 mph (145 km/h);
Power output	Engine:; Mirrlees: 1,250 bhp (930 kW) or 1,365 bhp (1,018 kW); English Electric: 1,470 bhp (1,100 kW); At rail: 1,170 hp (870 kW)
Tractive effort	Maximum: 35,900 lbf (159.69 kN)
Brakeforce	49 long tons-force (488.24 kN)
Operators
Career
Operators	British Railways; EWS; Fragonset Railways; FM Rail; Mainline Rail; Nemesis Rail; Network Rail
Numbers	D5500–D5699, D5800–D5862, later 31001–31970
Nicknames	Goyles, Peds, Toffee Apples, Gurglers
Axle load class	Route availability 5 or 6
Withdrawn	1975–2017
Disposition	36 preserved, remainder scrapped

The British Rail Class 31 diesel locomotives, also known as the Brush Type 2 and previously as Class 30, were built by Brush Traction from 1957 to 1962. They were numbered in two series, D5500-D5699 and D5800-D5862. Construction of the first locomotive was completed in the final week of September 1957, and the handing-over took place on 31 October. The first Class 31 entered service in November 1957, after the launch of the Class 20 locomotive and was one of the Pilot Scheme locomotives ordered by British Railways to replace steam traction.

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