I think it'd be interesting and maybe useful for less hardcore players who are simply looking to jump into the game and get into a timetable quickly after doing all the scenarios if there were the ability in the main menu for the game to select a random unfinished timetable the full list of timetables in all owned routes.
I guess such a feature would be useful if you don't really know what you want to play, and let the game just pick any uncompleted timetable service randomly, with random weather settings I suppose, and picking any random train from the substitution possibilities.
I think this would be a really fun idea for the casual player! Particularly if the weather and time settings were randomly generated. Would make life entertaining with a "surprise every time" button!