I'm an engineer from Europe. I have an idea of a light suspended rail for point-to-point transportation (personal public transportation). It should be divided into two main parts — 1) high speed, high performance network for city, and 2) low speed, low performance, but low cost and low maintenance network for suburbs. I'm not sure is my idea viable, because, IMHO, it should be already developed in the USA long time ago. :-/