Hi 1993matias,
first things first: Welcome to the Bahn-Forum
I haven't used the English version, so some of my translations might be off, but I hope it is still understandable. Also, I'll try to describe with words what you need to do, since I'm not familiar with the English abbreviations...
What you need is a shunting point, where you need to enter that route A is switching/shunting and the back part of the train gets a new route name B.
Make sure that the shunting points default is set to "keep going". Also, in the "Shunting options" tab you need to check the following:
(a) separate trains if possible
(b) new route for back part of the train
If you later want to couple the two pieces back together, and continue as route A, you also might want to check
(c) new train number for back part of the train
On the return, make sure (!) that route B arrives at the station first, and set a shunting point which is valid for route B only, and in the shunting options check the "forward part of train in coupling mode" and "do not turn around". Also make sure that the "turn train around" checkbox is UNchecked.
I have attached 4 screen shots, the first two are from the shunting point for the uncoupling trains (RB50043 is the incoming route, RB50044 is what the second half of the train becomes), the latter two pictures are for the return, RB50044 arrives first and has the higher train number (you need to make sure of this for it to work).
DerPhysiker
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