From Green to Blue the Class 37 Speedrun #class37 #Diesel #BritishRail #fyp

British Rail Class 37 – The Growling Workhorse of the Modernisation Era

The British Rail Class 37, affectionately known as the “Tractor” by enthusiasts and railwaymen alike, is one of the most iconic diesel locomotives ever to run on Britain’s railways.

Built between 1960 and 1965 by English Electric at Vulcan Foundry and Robert Stephenson & Hawthorns, a total of 309 locomotives were constructed. Designed as part of British Rail’s Modernisation Plan, the Class 37 was intended to handle mixed traffic duties — and it did so with remarkable reliability for decades.

Powered by the unmistakable English Electric 12CSVT engine producing 1,750 horsepower, the Class 37 became famous for its distinctive growl — a sound that still echoes across preserved railways and mainline excursions today.

From heavy freight in South Wales, passenger services in Scotland, petroleum trains in East Anglia, to civil engineering duties across the network, the Class 37 proved extraordinarily versatile. It worked in some of the harshest conditions in Britain — from the Highlands of Scotland to the rugged Cambrian Coast.

Over the years, many were refurbished into sub-classes including 37/4s for Scottish passenger work and 37/5s and 37/7s for heavy freight. Despite their age, a surprising number remain operational today in preservation, on charter trains, and even in specialist mainline roles.

In this video, we explore:

The origins of the Class 37

The engineering behind the English Electric design

Why they earned the nickname “Tractor”

Their nationwide duties and regional strongholds

Refurbishments and sub-classes

Their preservation legacy and continued mainline appearances

Few locomotives capture the spirit of Britain’s diesel transition quite like the Class 37. Rugged, noisy, and dependable — they became a true symbol of post-steam railway Britain.

If you love classic British diesels, railway nostalgia, and in-depth transport history — this one’s for you.

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