Make the rail cars intelligent and autonomous. Arrange them behind the engine in a way that the first car(s) behind the engine are filled with automobiles for the terminal destination. The following cars for intermediate 'stops', and the last car(s) for nearer stops. Let the train pass through, while decoupling the last wagons automagically shortly before the station, switching them onto some side track with on- and off-ramps, engaging their brakes, or use some system which does that in switching yards after they roll off the 'hump', let the automobiles roll off, collect the wagons and send them back with any another train travelling in the opposite direction, or whereever there is demand.

Networks..., tokens..., packets..., switches..., routers..., NOT fixed circuits.

Or just use an effing Über at the destination...