This song is about having to endure a subway ride to work which I had to do when I used to work in Chicago. Usually I would have to stand the entire trip. The subway or elevated train was packed with too many people. One time on a crowded elevated train I was standing next to the door. The train stopped at the wrong place and for some reason the door opened. If I was pushed out it would have been a long fall to the ground and that would have been the end of me. Fortunately nobody moved.