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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 several years of construction from 1919 to 1926. The first examples were constructed for the London and South Western Railway, 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 and its publicity department gave the locomotives names associated with Arthurian legend. The Chief Mechanical Engineer of the newly-formed company, Richard Maunsell, increased the King Arthur 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. Maunsell's successor, Oliver Bulleid, further improved performance by altering exhaust arrangements. The locomotives continued operating with British Railways (BR) until the end of 1962. One example, 30777 Sir Lamiel, is preserved as part of the National Collection and can be seen on mainline railtours.