British Rail Class 172

The British Rail Class 172 is a British diesel multiple unit passenger train from the Turbostar family, built by Bombardier Transportation at its Derby Litchurch Lane Works for inner-suburban services. It has four sub-classes, 172/0 and 172/1 as two-car sets without end gangways, 172/2 as two-car gangwayed sets and 172/3 as three-car gangwayed sets, all with a top speed of 100 mph. The class is lighter than other Turbostars thanks to Bombardier FLEXX-ECO bogies, a development of the B5000 bogies of the Class 220 Voyager, and it has mechanical rather than hydraulic transmission. London Overground and Chiltern Railways took the first sets, and the entire class is now operated by West Midlands Trains on the Snow Hill Lines and the Leamington Spa to Nuneaton route.