The LMS Class 4P Compound steam locomotives had a wheel arrangement of 4-4-0 and were designed for hauling passenger trains. A total of 195 engines were constructed between 1924 and 1932 by the LMS Derby Works, LMS Horwich Works, North British Locomotive Company, and the Vulcan Foundry. These locomotives were almost identical to the MR Class 1000, of which there were 45 of the class. It was decided that the driving wheel diameter should be reduced in size from the MR engines. Each locomotive was withdrawn from service between 1952 and 1961, with none surviving into a preservation status.