OK, here are functional train tracks to integrate into your map for the future train coming to Beamng.drive as a user vehicle mod. The train isn't quite ready for release yet.
Mapper's resource: Functional Train tracks
WORKING KNOWLEDGE OF THE IN-GAME TERRAIN EDITOR AND SOME BASIC SCRIPTING REQUIRED.
These train tracks were sent to me, for a map I am making, by Chris_Lucas on the Beam forums here, thanks Chris. I believe he said to me that these originally came from Rig...Mapper's resource: Functional Train tracks