AutoCAD Inventor :: Making Train Go Around A Track

I have been trying to make a train that i made roll on a track. I have seen youtube videos of people who have made their train go around a track (I have the same dimensions as the people in the video through project lead the way).

I have the train constrained to the track with a tangent constraint. How to make the wheels turn on the track (i know how to make the wheels turn, i just do not know how to make all the wheels turn in unison/together and how to make them actually move along the track instead of make the wheels turn in place. 

Here is a picture