here's a rough one I knocked up today just to give you some ideas
P1030115 by , on
wheel is from a disk brake out of just a car but needs to be the same width as the wood track which in this case is a little narrow so naturally it will want to wear on one side of the track instead of evenly on the top and sides the steel strapping I have used I would not recommend using it as it has small holes in it and will wear out very quick but something like this would work well a little thicker with no holes I couldn't find more than 1 disk brake in my backyard so you kind of get the idea just imagine a second wheel on the other side of track and 2 more wheels at the back of the 2 front ones the idea of the metal strap is to save the wood getting worn under it
P1030115 by , on
wheel is from a disk brake out of just a car but needs to be the same width as the wood track which in this case is a little narrow so naturally it will want to wear on one side of the track instead of evenly on the top and sides the steel strapping I have used I would not recommend using it as it has small holes in it and will wear out very quick but something like this would work well a little thicker with no holes I couldn't find more than 1 disk brake in my backyard so you kind of get the idea just imagine a second wheel on the other side of track and 2 more wheels at the back of the 2 front ones the idea of the metal strap is to save the wood getting worn under it