My son had his first pinewood derby this week. He and I spend many many hours building. We tuned his car to be a rail rider but when our track was set up, we discovered that there were no center rails! I was shocked. The track used side rails instead. Needless to say, it slowed our car considerably since it was now riding with the non dominate wheel and probably the back wheel as well against the side rail instead of the inside of the dominate wheel alone. Still, even with this hinderance, my son took second place. How common are tracks without center rails? Thanks!