If they really run that train every single day year round, and it almost always sells out, it can't just be people going south and back, or the winter trains would be empty.

I think it's just a common trip and the train is cheap/convenient enough.

I stand corrected. I thought it was a less frequent thing. Assume a lot of families do the theme parks that you really need a car for but they don’t want to do the long drive from the mid-Atlantic. Don’t know if it makes money though.