British Rail Class 37

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English Electric Type 3
British Rail Class 37
Muir of Ord railway station in 1988.jpg
Class 37 in British Rail large logo livery at Muir of Ord railway station, 1988
Type and origin
Power typeDiesel-electric
BuilderEnglish Electric at Vulcan Foundry and Robert Stephenson and Hawthorns
Build date1960–1965
Total produced309
 • WhyteCo-Co
 • UICCo'Co'
Gauge4 ft 8 12 in (1,435 mm) standard gauge
Wheel diameter3 ft 9 in (1.143 m)
Minimum curve4 chains (80 m)
Wheelbase50 ft 8 in (15.44 m)
Length61 ft 6 in (18.75 m)
Width8 ft 10+12 in (2.71 m)
Height12 ft 9 in (3.89 m)
Loco weight100 long tons (102 t) to 105 long tons (107 t)
except 37/7 and 37/9 class - ballasted to 120 tonnes[1]
Fuel capacity890 imp gal (4,000 l; 1,070 US gal) increased to 1,690 imp gal (7,700 l; 2,030 US gal) on rebuild[1]
Prime moverBuilt: English Electric 12CSVT
37/9: Mirrlees Blackstone MB275Tt or Ruston RK270Tt
Main: English Electric EE822, Aux EE911/5C
Rebuilt locos:
Main: Brush BA1005A alternator, Aux: Brush BA606A [1]
Traction motorsEnglish Electric [1]
Transmissionelectrical (DC traction motors)
MU working Blue Star
Train heating37/0: Steam generator
37/4: Electric Train Heat
Remainder: None
Train brakesVacuum, Dual, or Air
Performance figures
Top speed90 mph (140 km/h)
Power outputEngine: 1,750 bhp (1,305 kW)
Tractive effortMaximum: 55,500 lbf (247 kN)
Continuous: 35,000 lbf (156 kN) @13.6 mph (22 km/h)[2]
Brakeforce50 long tons-force (498 kN)
Railroad(s)British Rail
DB Schenker
West Coast Railway Company
NumberD6700–D6999, D6600–D6608; later 37001–37308
NicknamesTractor, also Syphon, Growler or Slugs[3]
Axle load classRoute availability 5
except subclass 37/7 RA 7

The British Rail Class 37 is a diesel-electric locomotive. It is also known as the English Electric Type 3. The Class was ordered as part of the British Rail modernisation plan.

The Class 37 became a familiar sight on many parts of the British Rail network. They were on Inter-City services in East Anglia and within Scotland. They also performed well on secondary and inter-regional services for many years. The Class 37 is known by railway enthusiasts as a "Tractor". This nickname came from the similarity of the sound of the locomotive.

References[change | change source]

  1. 1.0 1.1 1.2 1.3 "The Railway Centre - Class 37". Archived from the original on 2013-09-26. Retrieved 2010-03-29.
  2. "Locomotive Database - BR Class 37 Technical Data". 2012. Retrieved 24 July 2012.
  3. "Locomotive, DMU and EMU Nicknames". Archived from the original on 2010-01-30. Retrieved 2010-03-29.