The London, Midland and Scottish Railway (LMS) pioneered the use of diesel shunting locomotives in Great Britain. The variety of experimental and production diesel shunters produced by the LMS is summarised below. 5519 renumbered ZM9 This was an 0-4-0 diesel mechananical shunting locomotive built by Hudswell Clarke for the Crewe Works Narrow-gauge railway in 1930. It was the first diesel locomotive supplied to a major UK railway. It had a McLaren-Benz 2-cylinder engine of 20 hp at 800 rpm. It was transferred to Horwich Works in 1935. It was renumbered ZM9 by British Railways and survived until 1957. 1831 This was the first experimental, standard-gauge shunter, nominally rebuilt from a Midland Railway steam locomotive in 1932 (originally built in September 1892 by the Vulcan Foundry). The rebuild therefore inherited the same number (1831), although little of the steam locomotive was actually re-used. 1831 was not successful, but it did provide useful data for the further development of the diesel shunter design. It was withdrawn from service in September 1939 and converted to a mobile power unit, emerging in its new guise as MPU3 in November 1940. It was scrapped in the 1950s (sources vary as to exactly when). 7400–7408 later renumbered 7050–7058 A further nine prototype locomotives were built 1932-1935 by a variety of manufacturers. These were built allocated the number series 7400–7408. These were allocated the number series 7400–7408, but the LMSR soon realised that this number range was too limited for the number of production diesel shunters that were anticipated, and a new number series commencing with number 7050 was used. Only 7050–7053/7058 carried their original numbers (7400–7403/7408), and they were all renumbered in November/December 1934, some before they had actually entered service. For detailed information see the main articles: LMS diesel shunter 7050 LMS diesel shunter 7051 LMS diesel shunter 7052 LMS diesel shunter 7053 LMS diesel shunter 7054 LMS diesel shunters 7055/6 LMS diesel shunter 7057 LMS diesel shunter 7058 7059–7068 These were 0-6-0 diesel-electric shunters built by Armstrong Whitworth in 1936. 7069–7129 later renumbered 12000–12042 Details of the four classes allocated numbers in this range are included on other pages, as follows: 7069–7078 / 12000–12001 : British Rail Class D3/6, twin motor 7079 / 12002 : British Rail Class D3/6, twin motor 7080–7119 / 12003–12032 : British Rail Class D3/7, single motor, jackshaft drive 7120–7129 / 12033–12042 : British Rail Class D3/8 (Later TOPS Class