I just saw a video of Z scale cars running on a highway; there was no information where to buy this or how to make this. I would love to have a cars & trucks running on a road on the layout that I am building. I think it works with magnetic tape in the roadbed and battery powered vehicles, but I need more information where to get what I need and how to do this. Or is there an electric wire/track in the road and the car wheels like train wheels or a "electric pickup shoe"? Or a string or wire hidden to pull the vehicles? Or what, what, what? "Z went the strings of my brain."