I'm surprised all the discussion is about building routes, the most difficult and time-consuming type of content to create. Has anyone tried creating scenarios for existing routes?
Yeah, it can be done. the only but that at moment is buggy is creating the Scenary tiles, some routes its crashing on. Also, the Scenario Manager BP that you make an instance of isn't working as expected so scenario objectives won't work at the moment. If however you just wanna make a scenario from a timetable pov go ahead, it's worked lovely for me with little issues.
All you need for that is a RouteTimetable blueprint and that should work for PIE of your route of choice.