The closest I can think of is Personal Rapid Transport[1], which is a light-rail/monorail network of individually powered (small; 3-person or so) vehicles. Var

The closest I can think of is Personal Rapid Transport[1], which is a light-rail/monorail network of individually powered (small; 3-person or so) vehicles. Various schemes for routing have been proposed, many of which are conceptually similar to packet-routing of the carriages. [1] https://secure.wikimedia.org/wikipedia/en/wiki/Personal_rapid_transit https://secure.wikimedia.org/wikipedia/en/wiki/Personal_rapi...