There's no practical difference between 'tram", "train" and "light rail". There are lots of autonomous trains all over the world. Many airports use them. Many

There's no practical difference between 'tram", "train" and "light rail". There are lots of autonomous trains all over the world. Many airports use them. Many city subways use them. You probably haven't been looking hard enough. They are there. The first time you ride in one can be a little unnerving when you can look out through the front window and there's no driver blocking your view.