We've raced on two center tail wooden tracks in the last year. One is pretty tip top. The other was a demolition derby. On the demolition track, the parents actually stopped the race (with permission from the girl scout leader) fixed several joints: wood glue, screws, sanding. The race was started over from beggining then. Part of the problem with the cars coming off were there were a lot of three wheelers, including ours, that had no steer. The cars would move off the rail (out from the dom) and the lifted wheel would slide over the rail. Good luck!