Railbus
A fictional 4-wheeled railbus based on the default class 112. Mechanically wise, it uses specs from the Wickham railbus including a shorter range gearbox, lighter bodyshell and less power. The brakes are very strong, so you will have to be careful with them.
Specs:
Top speed of 55mph
~105hp Engine
Tare mass of 11.5 tons
4-speed short-range manual gearbox (ratios listed on website below)
Detailed specs of the real Wickham railbus: https://www.railcar.co.uk/type/wickham-railbus/
Thanks to Lapioware and the DRS Discord server for their help with debugging issues.