How to stop different services coupling together inside a portal (instead of coming out separately at their proper departure times). I am fed up with getting 24 car Aventra services which then play havoc with the signalling. Note - This is in Scenario Creation and, sort of, involves me 'stacking' trains in portals. (See below a screenshot of an Aventra coupled to a CL387 unit from another service. In this case the Aventra should have come out of the portal 5 minutes before the 387 yet it is behind it).
