The Class 101 were diesel-multiple units built by Metro-Cammell in Birmingham from 1956 to 1959. They went on to be one of the most highly successful and long-lived first-generation DMUs, with the last one being withdrawn from service on 24th December 2003.
Four Class 101 packs have been released. The first included four liveries and was discontinued shortly after the release of Train Simulator 2012. The apparent re-release contained simply the BR Blue and Blue/Grey liveries, while the Strathclyde DMU pack only includes the Strathclyde PTE livery. In 2014, a version in Regional Railways livery was released, which was free to owners of any Class 101 pack.