I agree, I've had some really dismal experiences taking the bus. Also, because I've taken the train as well as the bus between Washington DC and NYC, I have to say that the scenery on the train is definately a LOT more interesting, especially from 30th St. Station in Philadelphia, and New York.
Tell me when you get there... Which do you think is worse, Penn Station or Port Authority? 
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When There's No There to get to, I'm so There!