After dropping off the two faulty wagons at the shed I could not continue onto the main yard line due to a stale red. I probably was there for 30 minutes without any changes. I tried contacting the signaler and it still didn't let me continue. When I check the 2D map there were no oncoming trains. This was done on a regular PS4
I had the same issue. Second time it worked. Maybe saving before the stop at Wagon Repair Spur instruction could help so you don't have to replay all of the first part again. Some have said to drive through the shed but that was not necessary for me. The shunt signal TY177 would sometimes think there was a train in section ahead when there was not.
