Comment by stragulus

Yup. Any delay in Manhattan during rush hour, and the trains just pile up waiting to get into Manhattan in the outer boroughs. And in the outer boroughs, you often don't have the luxury of being able to choose from multiple lines. So all in all this means that your morning commute could last anywhere from X ('scheduled' commute time) to X + 45 minutes, occasionally even worse. And you'll probably be packed like sardines inside the cars as well, hopefully with a working AC if it's not freezing outside.