> Congratulations, you just reinvented public transit.

Reinvented, but much better. It's the difference between Circuit-Switched vs. Packet-Switched in networking. Trains are extremely inefficient use of resources. They require a dedicated and very expensive path, cannot re-route around problems (e.g. broken tracks or obstructed tracks), and frequently travel at a fraction of their capacity. Properly sized and routed electric vehicles are much more efficient in terms of cost per mile, travel time, and almost any other metric.