Come on DTG.... This DLC worked without issues on TSW 2020. The scenario in particular is Tank Trouble. Once you arrive at Tees Yard to remove the faulty wagon, as well as recoupling up to the train you are then required to pass through Tees Yard before heading to Middlesbrough. Signal TY553 remains red for the entirety of the time you are cutting the train to remove the faulty tanker, and stays red after you've recoupled up to head back through the yard. I've tried EVERYTHING to make it work.... Uninstalled and reinstalled the game Uninstalled and reinstalled the class 31 DLC specifically Restarted my Xbox several times Rebooted my router. Ensured I ran the scenario with all safety systems isolated Even tried the scenario with all safety systems engaged It happens roughly around 9am to 10am on the scenario timer. Signal TY553, is the signal as well as (I think...) Signal TY554 needs to be checked. It NEEDS to be fixed.
Which model XBox are you on? Just to try and narrow possible causes down. Just gonna assume you never saved and reloaded, since the signal bugs from that are known to everyone at this point.