Send a train down a two way track with a fork. One side of the fork is blocked. The other side has a trainstop in the opposite direction the train is traveling.What did you do?
The train fails to go into the empty block with the trainstop.What happened?
I expected the train to enter the empty block.What did you expect to happen instead? It might be obvious to you, but do it anyway!
The expected behavior only is achieved when the train stop is removed.