The London, Midland and Scottish Railway (LMS) introduced a number of railcars to service between 1933 and 1939. Most were single units but one was a three-car articulated set. Leyland Single units The LMS bought three four-wheeled diesel railcars from Leyland Motors in 1933. These were allocated to LMS diagram D2132, although this may have been after they were delivered, and may have been required when modifications were made. They were numbered 29950–29952 in the multiple unit section of the LMS carriage number series. Each had 40 third class seats arranged 2+2 either side of a central gangway and were powered by a diesel engine. After trials between and they worked from to and and subsequently at in Lanarkshire. They passed to British Railways when the LMS was nationalised. BR withdrew them in 1951, so they never received TOPS classification. Articulated unit In 1937, the LMS decided to produce a more modern diesel train for itself. This was a three-car articulated railcar built to LMS diagram D1996 and outshopped from Derby Carriage and Wagon Works in 1939. The cars were numbered 80000, 80001 and 80002. The streamlined three-car train was a single articulated unit; the two outer coaches were each long and rested on a centre coach that was long. The articulation was an idea that had been already taken up by Sir William Stanier for some locomotive hauled stock. Mechanically, the train was a development of railcars that had entered service from 1933 on the LMS Northern Counties Committee's (NCC) lines in Northern Ireland, using an identical arrangement of in-line powertrain as NCC railcars Nos. 2–4. Under each coach were two vertically mounted Leyland diesel engines driving the inner axle of each bogie through a Lysholm-Smith torque converter. There were six engines for the three-car set which gave a total power of . The whole unit weighed 73 long tons, so this yielded a power/weight ratio of slightly more than 10 bhp/ton which provided a main line standard of performance with a maximum speed of . Accommodation in the end cars was split into two saloons with 26 seats in the outer saloon plus a lavatory, and 28 seats in the inner saloon, all seats being reversible and third class. Between the outer saloon and the driving cab was a small luggage and brake compartment. The centre car was a composite with a 30-seat third class saloon with a