The British Rail Class 101 diesel multiple unit was built by Metro-Cammell at Washwood Heath in Birmingham, England from 1956 to 1959, following construction of a series of prototype units. These classes proved to be some of the most successful and longest-lived of BR's First Generation DMUs, second in longevity only to the Class 121, with the final five units being withdrawn on 24 December 2003. In 2000, the Class 101s were withdrawn from ScotRail. The oldest set was, by then, just over 47 years old.

The Class 101 is featured in the Northern Trans-Pennine route, which is set in 1983, when they were used for local commuter services on the trans-Pennine route from Manchester Victoria to Leeds. It is also featured in the upcoming Tees Valley Line, where it also operates local commuter services. The Northern Trans-Pennine variant has 2 carriages whereas the Tees Valley Line version has 3 carriages.

The Class 101 is the first train introduced into Train Sim World with a geared throttle; to change up a gear, the driver is required to cut the throttle, engage the next gear, then throttle up again.

Northern Trans-Pennine
Locomotives BR Class 45 - BR Class 47 - BR Class 101
Rolling Stock BR Mk1 - BR Mk2
Locations Manchester Victoria - Huddersfield - Leeds
Operators British Rail
Tutorials Diesel Locomotives Introduction - Class 101 Introduction (NTP)
Scenarios Trans-Pennine - Driving Rain - Down and Out - Rescue Run - Red Bank Rotation
DLC BR Heavy Freight Pack
Tees Valley Line
Locomotives BR Class 08 - BR Class 37 - BR Class 101
Rolling Stock BBA Wagon - HEA Hopper
Locations Darlington - Middlesbrough - Saltburn
Operators British Rail
Tutorials Class 37 Introduction - Class 101 Introduction (TVL) - Class 08 Introduction (TVL)
Scenarios Tubeliner Diversion - Coal Hauler - Steelworks Shunting - Three Becomes Two - Seaside Summer Special
British Locomotives and Multiple Units
Diesel Locomotives BR Class 08 - BR Class 09 - BR Class 33 - BR Class 37 - BR Class 40 - BR Class 43 - BR Class 45 - BR Class 47 - BR Class 52 - BR Class 66
Diesel Multiple Units BR Class 101 - BR Class 166
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