When I was a kid my Dad bought me an electric train set. It was a Lionel with a small oval track. I was one frustrated boy, finding out that every time I put the train on high it would fall off the track as soon as it hit the curve!
What good is a train that won’t go FAST ? !
It didn’t take much thinking to realize I needed big curves. For forty years, through my teens and twenties and thirties, I dreamt of building a train that would run through my entire house.
One day I went to a local dance club and they had Christmas Tree lights floating through the stage. Knowing tree lights sag, not float, I went to inspect. Wire is what suspended those lights. Two days later I had figured out how to use two pieces of wire, one above the other for dynamic tension, to hold my train in the air.
The next day I was knocking holes in my walls. Six weeks later my train was making a complete loop. And, yes, I can crank that sucker up!