My suggestion is that when going to select a timetable service, we can select a point (similar to how we can select one for spawn on foot) and then are shown the relevant services to/from that point and the relevant times. So say for example we wanted to drive a pendolino from WFJ to EUS, we would be able to take one over and run with traffic to timetabled times, without needing to try to replicate in free roam or scenario planner, or trying to match up the on foot spawn time with one pulling in. The title says 'station', but this should also apply to depots/sidings etc. IMO where relevant.
Would be handy. Only other way is to look at the list of services, and for example search London Euston which will show all services to/from there.