A couple of videos showing a physics-based train in Leadwerks Engine using the Newton Game Dynamics 2.0 beta:
http://www.leadwerks.com/post/train2.wmv
http://www.leadwerks.com/post/train3.wmv
Instead of placing waypoints, you can just lay out track segments, and the train will go wherever the track takes it.
http://www.leadwerks.com/post/train2.wmv
http://www.leadwerks.com/post/train3.wmv
Instead of placing waypoints, you can just lay out track segments, and the train will go wherever the track takes it.