I haven't been on a train before but I did get to ride the DC Metro a couple of times. I thought it was a cool experience with the large swarms of people moving and you only have about fifteen seconds to enter/leave but you always had enough time. The people in DC are nice too, or at least no one would stare me down like a psycho.
Although, I do remember once on the DC Metro, like three hookers had a baby that kept crying and some short guy in a flannel shirt would yell, "YOU COULD BE TRYING HARDER!", at them. I was so tired when that was going on that I literally got off and entered a different subway car. Does anyone else have any public transportation experiences?