One night I got on the 6 train at Spring Street at about 7pm and the train was empty. The train in front and behind was empty, as well. This was literally the first time I have been alone in the City since I have moved here. It was quite discomforting - I kept looking for muggers or puke or feces or whatever would make people not want to be in this car. In the end, it was just a freak occurance, a part of living in the city of millions, when you find yourself alone.