With the flick of a switch, your normal racing set turned into something special with Tyco Nite-Glow. Even now I look at this setup and marvel at the loops, the headlights on the car and of course the ability for the track to light up in inky darkness.
I had one of these cars with the light-up headlights and I found them so fascinating that I would often hold the car in place and rev the engine just so I could study the tiny little headlights. I would do the same with my model train set so often that I would burn out the light.
Their just seemed to be something magical about a toy with a detail that makes it that much more realistic (that could also defy gravity by doing a loop).