This service is completely broken and also introduced in journey mode. There's a red signal at km 32 which will never turns green. The issue is already known at least since april this year. That is extremely annoying and frustrating. because I cannot complete this journey. I already posted this on steam discussions "troubleshooting" but no one seems to listen. I'm quite irritated as I hoped, DTG fixed already known issues before releasing TSW 2020 + introducing broken services.
I encountered a service in the LIRR expansion like this, too. That you can't even start because the very first sign never turns green as there is another train stopping on the same track. I don't remember which one it is but next time I'll take a note of it.
There is a workaround for the service mode (not from me). The journey mode is still broken. You can choose the service DB 86109 and free roaming mode and as time 9.55. You wait for the train and enter it and the dispatcher has the correct signal timing and the signal shows green. Service can be completed and shows also up in journey mode but not as completed. Still very unsatisying. DTG: Fix it or change it.
I can confirm that the workaround does work for PS4. This completes the service in timetable (service mode) but does not complete it in journeys. However, I do agree that DTG need to fix it.
I can confirm that DB86109 now works in journey mode after the latest update (v1.30). I also found it was noted in the latest patch notes