I was well on my way to completing one of the tutorials for Sand Patch Grade when 2 other locomotives came down the same track that I was on after uncoupling the 34 cars (as directed). They're stopped just in front of me now and I cannot proceed to the next stop location. What gives? Glitch?
My bad... just got more details on the tutorial (Westbound Delivery) and see that this has already been reported.
Sometimes the yard activities can be interrupted if another service activates with AI and gets in the way, but they can still be completed with some hustle on your part to stay out of the AI's way (or keep it out of your way).
I've had to do that a couple times. When I started the one I had an autorack coming straight at me. I had to back up onto another track to get out of the way then I was able to continue with the timetable.