What did you do? Did you just walk back outside or did you wait for them to remove it?On the Meteor, I ran into a red bar blocking the doorway to the cafe car from coach while the engine was being changed at WAS. I had detrained from my sleeper for a walk down the platform, and when I got too chilly I decided to board in coach and walk back to my room through the train.
I don't know whether that barricade is deployed when the cafe is closed en route, or was just being used because the power was off.