An intersting historical note on the use of highway trucks for use as motive power on rail. When the Allies started the Italian Campaign, the rail system in Italy was scrap from both bombings and the German destroying everything as they withdrew up the boot. The first MRS had no motive power to speak of when they landed in Naples. What they did initally is take the wheels off a rail car and mounted them on a 'duce' within a day or so, and had the first trains moving north with supplies. Each day they increased the number of trains and tonnage hauled.
This is a very interesting story/history of the 1st MRS from North Africa to the end of the war. Some interestesting insight that MIGHT be applied to Twilight 2000.
http://www.milhist.net/history/mrs-soloc.pdf