In the process of putting together a complex switching scenario for Munich-Augsburg, I've placed a number of AI trains near portals with the intention of loading the trains into those portals for the final version. Why? Simply because when I look at the 2D map while playing a scenario and see AI trains parked all over the place they irritate my aesthetic sense. Also, because it's usually possible and fun to do, all the more so because RSC says it shouldn't be possible.
Munich-Augsburg features a number of convenient portals, but many of them have proved unusable for "storing" AI trains because a single portal covers two or more tracks and I've just discovered that a train stored on one track of a multi-track portal winds up blocking trains whose final destination is another track covered by that same portal. I don't recall this happening previously, so perhaps it's the result of an update. Interestingly enough, most of these multi-track portals show up as individual track portals in the editor and on the 2D map, which can be very frustrating to scenario writers.
By the way, M-A does not have nearly as many portals as it could or, in my opinion, should. There are dead-end tracks all over the place without portals, the above-mentioned multiple dead-ends with only a single portal, and especially dead-end yard spurs where a terminal portal could prove very useful.
A tremendous improvement to TS would be the possibility of placing portals at the scenario editing level rather than just at the world editing level.
Regards,