Hmm, well I guess roads are cheaper than rails (i.e. rails along the entire route of the trip, not speed up rails like in a rail gun). And powering something fr

Hmm, well I guess roads are cheaper than rails (i.e. rails along the entire route of the trip, not speed up rails like in a rail gun). And powering something from fixed locations (guns) is cheaper than bringing your engine with you. So maybe it is like a train, one person per, but it runs on cheap road like track, and it's propulsion is provided by fixed stations. If each track was a straight run from station to station you could just ditch the wheels and whatnot and fire the thing between stations along the ground. There's no way it could move so fast and still use car roads, unfortunately, so it will still have problems buying track space or building tunnels or building elevated paths. Too bad it runs on the ground.