Well,yes and no...look at this photo on the left. lt's from the world fair in Seattle. That was in 1962. Monorails were a very popular idea in America at that time. People wanted to leave their cars at home and go to work by public transport. But they weren't successful-monorail are difficult to build and expensive to keep in good condition-so you're right. There are some monorails in the world...but not very many!