10 DC Metro Tips and Tricks
Tip #10: Watch those doors
Metro's car doors are not exactly friendly. Avoid being in the way when they are closing.
You may hear the warning while standing in a station waiting for your train, telling you that Metro car doors do not operate like the elevator doors you may be used to. They do not re-open when they are blocked, and when they close, they close fairly hard. Take the warning bells seriously and get yourself and your bags away from the doors. The train will not move with a jammed door, but it will not be a pleasant experience either.