whecsailorjr's idea of using Trainz to make a slot car simulation reminded me of a concept test I did to simulate outer space.
As others mentioned, invisible track was used. In this case a couple of maglev trains and two maglev stations were also used. The stations were put on a thin and tall pillars of terrain so that you could look at the "space trains" from below the level of the track or above as usual. All of the terrain was painted black and the clock was set to display a clear starry night sky.
Two meandering non-parallel ovals connected the stations. At points the ovals crossed over each other and the trains would cross over or under each other.
It was just a fun concept test, I didn't go any further with it.
As others mentioned, invisible track was used. In this case a couple of maglev trains and two maglev stations were also used. The stations were put on a thin and tall pillars of terrain so that you could look at the "space trains" from below the level of the track or above as usual. All of the terrain was painted black and the clock was set to display a clear starry night sky.
Two meandering non-parallel ovals connected the stations. At points the ovals crossed over each other and the trains would cross over or under each other.
It was just a fun concept test, I didn't go any further with it.