Parry People Movers Nº 35 at Wirksworth (image source: https://en.wikipedia.org/wiki/Parry_People_Movers) What is it? The Class 139 is a class of British mini-railcars, built in 2008 for them to run on the Stourbridge Town Branch Line. There was also a prototype, called Class 999. A Class 139 on display, sitting on top of a flatbed hauled by a Scania truck, 50033 can be seen in the background, in the BR Blue Large Logo livery. (image: https://en.wikipedia.org/wiki/British_Rail_Class_139) More Information: With the prototype Class 999, three of the class were built. London Midland are using them. Parry People Movers are thought to have intended to use a variation of the PPM60 model, called the PPM220, to bid for the contract to build a small fleet of experimental trains for use on the Penistone Line, and for the new generation diesel multiple units, intended as part of the Government's rolling stock plan. This will involve an articulated unit, with a pair of PPM60s on either end of a fixed passenger unit. The whole unit will have a capacity of up to 220 passengers and will be able to travel 60mph (100km/h) on railways and 50mph (80km/h) on tramways. The Penistone trial was however canceled, before a bidder was selected, and was replaced with an electric Rotherham-Sheffield trial, in September 2009. Inside a London Midland Class 139 rail-bus. (image: https://en.wikipedia.org/wiki/British_Rail_Class_139) What does it run on? It doesn't run on on diesel fuel, but on LPG. The unit uses a flywheel energy storage to recapture and supply the motive force for moving the vehicle. The concept is simple; the flywheel captures the vehicle's kinetic energy when brakes are used, and re-uses the energy for acceleration. The small engine is used to provide the flywheel and all other onboard systems electricity. Class 999 Prototype seen approaching Stourbridge Town. (image: https://en.wikipedia.org/wiki/British_Rail_Class_139) Why for Train Simulator? Even though the Stourbridge Town Branch Line isn't in Train Simulator, I would enjoy driving it around any UK-themed map. I think this small railcar should definitely be made for Train Simulator. ■ Thanks for reading! Disclaimer: I do not own any of the media shown here, nor do I claim to. All media belongs to their rightful owners. I just put them in here for illustration purposes.