No, those are called trains, and while they're great for shuttling a large number of people between two distant points, or along a line of points, they really s

No, those are called trains, and while they're great for shuttling a large number of people between two distant points, or along a line of points, they really suck for moving a large number of people between countless arbitrary points that are arranged in 2-dimensional space like a grid (or a metro area that's spread out in all directions). What you really want, to replace private cars, is SkyTran: tiny cars for 1-2 people, suspended from metal rails (which have a maglev effect to eliminate friction altogether), that are completely autonomous and take riders directly to their destination within a metro area. Each one operates independently, so you don't have to worry about what other users are doing or waste time going to stations that aren't your destination. IMO, it's shameful that we haven't done more to explore PRT (personal rapid transit). It could really revolutionize city and suburban life and eliminate the need for so many people to own cars, while also saving people so much time with commuting (since such a system, fully built-out, would have far higher capacity than our current road system).