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 type Diesel-electric
Builder English Electric at Vulcan Foundry and Robert Stephenson and Hawthorns
Build date 1960–1965
Total produced 309
 • Whyte Co-Co
 • UIC Co'Co'
Gauge 4 ft 8 12 in (1,435 mm) standard gauge
Wheel diameter 3 ft 9 in (1.143 m)
Minimum curve 4 chains (80 m)
Wheelbase 50 ft 8 in (15.44 m)
Length 61 ft 6 in (18.75 m)
Width 8 ft 10 12 in (2.71 m)
Height 12 ft 9 in (3.89 m)
Loco weight 100 long tons (102 t) to 105 long tons (107 t)
except 37/7 and 37/9 class - ballasted to 120 tonnes[1]
Fuel capacity 890 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 mover Built: English Electric 12CSVT
37/9: Mirrlees Blackstone MB275Tt or Ruston RK270Tt
Generator Original:
Main: English Electric EE822, Aux EE911/5C
Rebuilt locos:
Main: Brush BA1005A alternator, Aux: Brush BA606A [1]
Traction motors English Electric [1]
Transmission electrical (DC traction motors)
MU working Blue Star
Train heating 37/0: Steam
37/4: Electric Train Heat
Remainder: None
Train brakes Vacuum, Dual, or Air
Performance figures
Top speed 90 mph (140 km/h)
Power output Engine: 1,750 bhp (1,305 kW)
Tractive effort Maximum: 55,500 lbf (247 kN)
Continuous: 35,000 lbf (156 kN) @13.6 mph (22 km/h)[2]
Brakeforce 50 long tons-force (498 kN)
Railroad(s) British Rail
DB Schenker
West Coast Railway Company
Number D6700–D6999, D6600–D6608; later 37001–37308
Nicknames Tractor, also Syphon, Growler or Slugs[3]
Axle load class Route 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
  2. "Locomotive Database - BR Class 37 Technical Data". 2012 [last update]. Retrieved 24 July 2012.  Check date values in: |date= (help)
  3. Locomotive, DMU and EMU Nicknames