This locomotive has a 8 pin DCC Interface.

George Hughes originally designed the LMS Class 4 locomotives when he was the first London Midland & Scottish Railway Chief Mechanical Engineer working from Horwich, Bolton. They are noted for their appearance with large highly angled cylinders caused by restricted loading gauge. These locomotives were nicknamed 'Crabs', a term adopted due to the unusual altitude of their cylinders and associated 'gait' when underway.

Hughes retired in 1925 and Sir Henry Fowler altered some details before the introduction of the class in 1926. By this time, Fowler had moved all main LMSR locomotive design work to Derby. The Crabs were specifically designed for express freight and passenger duties, and with their large boiler and driving wheels they were capable of running at great speed. The locomotives were very active on the fast freight services.

245 locomotives were built in total. The original LMS Crabs were numbered 13000-13244, and BR numbered the locos 42700-42944. The first Crabs were withdrawn in 1961 and the last in 1967. Three have survived.