Background
Locomotive exchanges were commissioned by the fledgling British Railways (BR) during 1948, to test the best and worst aspects of locomotive design within the Big Four railway companies that had existed before nationalisation. The research gained from operating the best designs of the GWR, LMS, LNER and Southern railways on different areas of the British Railways network paved the way for several new classes of standardised locomotives to be constructed. These new locomotive designs were intended to replace some of the ageing designs inherited by British Railways.
The new classes were designed by Robert Riddles, who had previously designed the WD Austerity 2-8-0 and WD Austerity 2-10-0 locomotives for wartime use. The first design requested by the Railway Executive was for a new express passenger "Pacific" locomotive, designed specifically to reduce maintenance and using the latest available innovations in steam technology from home and abroad. Various labour-saving devices were utilised to produce a simple, standard and effective design, able to produce equivalent power to some of the "Pacifics" that were still available as legacies of the Big Four.
Read more about this topic: BR Standard Class 7
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