I'm pretty new to Unity3D game engine and game development, so don't judge me strictly. I import a model of the rail track, add rigid body component (with mass 1 and use gravity flag) and box collider component. Then I add train engine with rigid body (mass == 1, use gravity) and box collider and put it on the track. When I'm running simulation, train engine starts jumping like a ball (despite material for tracks and train is Metal (built-in Unity material)).
There is an important note that rail tracks are fixed (freeze position set in rigid body options). It seems to be natural. Anyway, if I turn off freeze position option then train engine does not jump, but tracks fly apart.
So I'm in trouble here. Can you please suggest what is the problem?
Thanks in advance.