.... remove the railroad track .... build a walking/bicycle trail!

[Trail Goer]

Originally Posted by FlyingScot

I don't doubt there are others, but I do doubt they are popular. Almost by definition, these are very low volume operations. Keep in mind that every car needs space between it and other cars on a single track, and no car can go faster than the car in front of it. This last piece is especially important--if there are 10 cars then the tenth car must be slower than the ninth, which must be slower than the eighth, which must be slower than the seventh...Otherwise it's a frustrating traffic jam. This is very different than bikes or walkers who can pass each other

They are becoming popular, that is why they are starting to spring up all over the place.