After setting a path a window pops up saying select preceding stations to stop at then asks for a departure time for those stops. Then the train your driving is temporarily added to the timetable so your train is on the departure boards for the duration whilst your playing that route.
That should've been a feature from the get-go honestly... it feels kinda sad to stop at a station, and just no one gets in.
100% this should be a given feature. Sad indeed that it isn't already so. We should also be able to create custom timetables too.