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Metro Train

I finished it. When a wall comes on front of the train he goes backward (but the train waits 15 second when he stops). And when a wall comes behind of the train train goes forward (train waits 15 second on where it stops).

The doors are automatic. (When a wall comes on front of it the all doors open. And when a wall comes behind of it the doors opens too.
(Doors closes when the train starts going. Have fun.