The LSWR N15 class was a British 2-cylinder 4-6-0 express passenger steam locomotive designed by Robert W. Urie. The class has a complex build history spanning eight years of construction from 1919 to 1926. The first batch of the class was constructed for the London and South Western Railway (LSWR), where they hauled heavy express trains to the south coast ports and further west to Exeter. Following the grouping of railway companies in 1923, the LSWR became part of the Southern Railway (SR) and its publicity department gave the N15 locomotives names associated with Arthurian legend; the class hence becoming known as King Arthurs. The Chief Mechanical Engineer (CME) of the newly-formed company, Richard Maunsell, increased the class strength to 74 locomotives. Maunsell incorporated several improvements, notably to the steam circuit. The new locomotives were built in batches at Eastleigh and Glasgow, leading to the nicknames of "Eastleigh Arthurs" and "Scotch Arthurs" in service

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