The LSWR S15 class is a class of 4-6-0 steam locomotive designed for freight work. They were designed by Robert Urie for the London and South Western Railway (LSWR). After design modifications several more were built by Richard Maunsell for the Southern Railway. A total of 45 were constructed at Eastleigh Works between 1920 and 1936, and saw service all over the Southern Railway's Western and Central sections. The Maunsell-modified design provided an excellent goods engine and it was best known for working heavy night express goods trains between Exeter and Nine Elms, Southampton. They were also vary capable passenger engines when used during peak holiday periods. Both the Urie and Maunsell S15s spent most of their working lives on the Southern's Western section. All class members saw service with the Southern Region of British Railways, although all had been withdrawn by 1966. Seven examples of the class have survived into preservation.
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