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British Rail Class 37

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Locomotive UK Diesel Preserved Mixed Traffic British Rail

description British Rail Class 37 Overview

The British Rail Class 37 is a diesel-electric locomotive developed by English Electric in 1960. It was one of the most numerous designs produced for British Rail, with over 300 units serving diverse roles including freight and passenger transport throughout the United Kingdom. These mixed-traffic locomotives are now frequently preserved and operated by enthusiasts and heritage railways, offering a glimpse into Britain’s railway history. They remain suitable for industrial use and preservation projects.

help British Rail Class 37 FAQ

Why do enthusiasts call the British Rail Class 37 a Tractor?

The nickname comes from the distinctive chugging exhaust note of its English Electric 12CSVT diesel engine. Others call the class a Growler for the same unmistakable sound.

How many Class 37 locomotives did British Rail build?

English Electric and Robert Stephenson and Hawthorns built 309 locomotives between 1960 and 1965. They were originally known as the English Electric Type 3 before receiving Class 37 numbers under TOPS.

What is special about the Class 37/4 subclass?

The 37/4 locomotives were refurbished with electric train-heating equipment, making them suitable for passenger coaches that needed an electrical supply. They became particularly associated with services in Scotland and Wales.

Are Class 37 locomotives still used outside heritage railways?

Yes, a limited number have continued in infrastructure, test-train and specialist duties decades after British Rail service began. Their longevity reflects a versatile mixed-traffic design and the availability of extensively rebuilt examples.

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