For anybody interestedintrains. I made this video some time ago to test a train following a real rail line on photo scenery.
To create the rail system I utilised Carrier and Convoy Planner (CCP by FS@War group) and made a map from railways in Open Street Map and changing their layer to a road so as to then create a Route Map in CCP. I then created a train model as a ground vehicle.
https://www.youtube.com/watch?v=z4PyHJ2EHWM