Not sure if you can do this. It would be good to be able to shunt and couple up to different rolling stock and mix different locos for double heading.
Would also be good to set up services which leave the map area so as to not block stations. There are some trains on Great Western where train leaves the map so AI trains can be programmed to run timetable services. Thought I would love Scenario Planner but with limited 2 way lines its too limited and not much of a challenge.
Agree. If you want multiple services going the same way as you, on the same line, you have to make sure to stop at a station before the end one (if they are in front).