page_title: British Rail Class 37
section_title: Axle load
hierarchical_section_title: British Rail Class 37 / Description / Axle load
caption_attribution_description: The cab of a British Rail Class 37.
context_page_description: The British Rail Class 37 is a diesel-electric locomotive. Also known as the English Electric Type 3, the Class was ordered as part of the British Rail modernisation plan. They were numbered in two series, D6600-D6608 and D6700-D6999.
  The Class 37 became a familiar sight on many parts of the British Rail network, in particular forming the main motive power for InterCity services in East Anglia and within Scotland. They also performed well on secondary and inter-regional services for many years. The Class 37s are known to some railway enthusiasts as "Tractors", a nickname due to the agricultural sound of the diesel engine of the locomotive.
context_section_description: The Class 37 has a relatively low axle loading for its size and power. With the withdrawal of most of the smaller types of diesel locomotive, this left it as the only mainline type available in significant numbers for lines with weight restrictions, and for a number of years 37s handled almost all locomotive-hauled services on the West Highland Line, the lines north of Inverness (Far North Line) and in parts of Wales. The Class 37 has Route Availability 5 and this is one of the main reasons it is still in use on the network.  Note that class 37/7 and 37/9 have an RA of 7 due to their extra ballast weights.
caption: Cab interior of loco no. 37052
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