Instead you build rails between major hubs (those that got the biggest airports usually) and add stops on some medium cities that happen to be on the way. It serves those living close enough of the connected cities that want to go close enough to another connected city. _close enough_ depends on the local connection options like regional trains, bus, bikes, trams… and if there’s nothing you just grab a cab or rental car. The city of departure can be reached with your own personal car which is usually a bit cheaper and faster (therefore more range). Most travels destination are big cities or close enough (business, tourism…).

Rail planing is a Pareto game.