The addon with the route was released August 2020, now we have April 2022. Meanwhile an expansion pack was released (I don´t have it). After long time I wanted to drive on the local S-Bahn from Düren to Cologne, but I can not complete them (tried several times from the timetable) because I became stuck short after Düren in front of red signals before Merzenich or Sindorf. Reason seems to be a AI train, that wants to come on same track from Cologne to Düren. Don´t know if that problem exists already after release, if so, then it still exists. So I have questions (at DTG) 1) Why this is not solved after 1 1/2 years? 2) When it will be solved? 3) Are these problems existing on the Expansion Addon too?
I answer myself: No, same bug on the expansion pack. Thanks DTG for same bug on new DLC and timetable. It was refunded now.
I ran a few of these services myself and while there indeed usually is a red signal shortly after you depart from Duren, it eventually clears after the ongoing train passes. But it really takes quite a lot of time, like 8-10 minutes sometimes, so you have to be patient. You can monitor the progress of the train in the map.
There are a lot of these on freight services in HRR- it can take a LONG time for higher-priority passenger traffic to clear.