Based on the chassis of the Royal Scot class, with the boiler from the large Claughton class, the ‘Patriot’ class of locomotives was the London Midland and Scottish Railway’s approach to building a ‘Second Division’ 5X designation locomotive at the beginning of the 1930s, a role that would later be mainly fulfilled by the Jubilee class.In October 1930, the Locomotive Committee of the LMS gave the go-ahead to Sir Henry Fowler for the rebuilding of two Claughton locomotives, Nos.5971 and 5902, into a new class by utilising new frames, spare tenders and an existing type of boiler.