Sounds like a very good idea - a sort of hybrid between public & personal transport! It might well turn out to be the transport system of the future. But the biggest problem would be building the immense network of rails - what big city is going to invest fabulous sums of money in such a system?
In areas of new construction it might be feasible but in the established districts of big cities I can´t see how they would built such a network. No, the only way forward is to build smaller, lighter, more efficient cars. I, myself, am not a driver but It´s undeniable that once you´ve owned a car you´re never going to give it up easily! Being dependent on public transport all your life is a bane, - at times at least! - so I would welcome a system such as described!
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