London Midland is a company that operates train services between London and the West Midlands in England. They operate two main groups of services - main line services on the West Coast Main Line and "city" services centred on Birmingham. The main line services use new class 350 electric multiple units alongside older class 321 sets, whilst the city routes use class 150 and 170 diesel units and class 323 electric units. London Midland also operates the shortest branch line in the country, the line between Stourbridge Junction and Stourbridge Town. This route is operated by a single class 139 Parry People Mover.