Instead of having a single train commute, start trains on a regular timetable, independent of the distance between the cities. This way the traffic marking on the rails will indicate how many city-pair connections run through it, as opposed to the current situation, where a nearby city-pair can cause a very red rail between them because the single train commutes very frequently.
Instead of having a single train commute, start trains on a regular timetable, independent of the distance between the cities. This way the traffic marking on the rails will indicate how many city-pair connections run through it, as opposed to the current situation, where a nearby city-pair can cause a very red rail between them because the single train commutes very frequently.