Waiting for the doors to close

On a cold and rainy night, it is disturbing to be on a train at a station when the doors open and stay open for a long time.   You pray they will close especially if you are alone on the train and wonder if someone dangerous will rush in with trouble on the mind.  The delay can be nerve-wracking if you know you are vulnerable and have no way to protect yourself from someone with a nefarious motive.