Make one gameobject always touch another gameobject

Hey,
I am trying to make a game involving trains, and I wanted to be able to make the train wheels always be on the track.
Is there a way that I can make the wheels be permanently on the track?
Thanks in advance,
Tom

Take a look at the spline controller. I’ve not used it myself but appears to do what you want.

[Hermite Spline Controller][1]

It maps a path for your train to follow.
[1]: http://wiki.unity3d.com/index.php?title=Hermite_Spline_Controller