Green Lantern: First Flight
This car is being hoisted up the lift.  Throughout the ride, the track is in a rectangular box configuration with four tubular rails and a lattice of steel beams holding the rails in place.  Cars only use two of the rails, the other pair is just for structural support.

On the upper right of this picture, you can see a metal "L" bracket mounted over one wheel.  It has a bonding strap that extends from the bracket to the rail.  It ensures that the car is electrically connected to the track.  The wheels are made of plastic, an electrical insulator, so cars would develop a static charge if this grounding strap did not make contact with the metal track.

©2017 Joel A. Rogers.