The railway was originally invented as the most efficient way to move a heavy load across any terrain. As well as the use of a smooth rail, reducing rolling resistance by two thirds, coupling allows capacity (or occupancy) to be extended. A single engine and driver can replace one per carriage. A safe interval at speed is needed only between trains, maximizing flow along the track.
Scheduling a continuous unimpeded path to every service is the third great trick of the railway, gaining both speed and predictability.
Trains can be long, rather than wide. A conduit can be less than half the width of a comparable road, with around forty times the capacity per unit aperture, and three times the speed. A railway can thus offer (at least) twenty times the value for money.
Last, but perhaps most important, a railway can easily be electrified, and can now be fully automated.
From now on, boys will have to dream of something other than driving trains.