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The British Rail Class 37 diesel locomotives, also known as the English Electric Type 3, were commissioned as a part of the 1955 British Rail modernisation plan. In total 309 were built, with the order split between English Electric's Vulcan Foundry at Newton-le-Willows and Robert Stephenson and Hawthorns, Darlington.

The Class 37 became a familiar sight in many parts of the British Rail network, for example, forming the main motive power for Inter-City services in East Anglia, within Scotland, and so on. They were relatively rarely seen on the more 'glamorous' main line expresses, but on secondary and inter-regional services they performed well for many years.

In the 1980s many locomotives were refurbished, which has meant the Class 37 fleet is one of the longest surviving classes on British railways. However, the introduction of new Class 66 locomotives has meant many locomotives have been withdrawn or scrapped. The last few British examples are operated by EWS and Direct Rail Services, who retain small fleets, with several examples also operated by spot-hire companies. However, second-hand Class 37s have also proved popular in the export market, with some examples currently operating in Spain and France (serving the construction of these countries' high-speed railway networks).