I have a huge slot car set. Probably almost a quarter mile of track. no joke. I forget the brand, but it was one of the super popular ones. ( figures right? ) pretty much everyone on the block got a kit, then the next year, eveyone had them out for garage sales. I bought them all up. When I was 17 or 18, my brother and I set up every piece of track we had. It went all over the house. We had 4 straightaways up and down the flight of stairs. I think we went into every room except one of the bathrooms because there was nto enough room to turn it around. Just abotu every plug we passed we hooked up one of the power transformer things. There were splices everywhere, and boosters so the signal would travel over the whole course.
It took us a good 2 days to set up and debug. Every time something moved, a piece would disconnect somewhere. the tuns at the bottom of the stairs, and some of the crossovers ( height wize ) were a pain in the butt, but it was totaly worth it.
I still have it all in the attic.