| Model | Class 37 |
| Year | 1960-1965 |
| Engine | English Electric 12-cyl, pressure charged |
| Horsepower | 1750 @ 850rpm (1,300kW) |
| Starting tractive effort | 55,500lb/f |
| Continuous tractive effort | 35,000lb/f @ 13.6mph |
| Maximum speed | 90mph |
| Fuel Capacity | gallons |
| Driving wheel diam. | 3ft 9in |
| Length | '" |
| Weight | 102-107ton |
Original Numbers....
D6600-D6608 (9)
D6700-D6999 (300)
Re-numbered
37001-37308 (308)
Reclassified...
37-3
Re# for use on Scotland's British Steel Trains.
37310-37314
37320-37326
37-4
Refurbished with electric train heat.
37401-37431
37-5
Refurbished with alternator replacing main generator.
37501-37540
37650-37699
37-7
Refurbished with alternator and ballast weights.
37701-37715
37780-37815
37880-37899
37-9
Refurbished power units
37901-37906
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