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I remember one time a few years ago when the were enormous lines for both the US air shuttle and security at DCA on a Friday afternoon. It was 30 past the hour and I was looking at least at missing the next two, maybe three shuttles to LGA. I called my assistant and told her to buy me a ticket on the Acela leaving on the next hour. Went out, got in a cab to the train station. Got there 15 minutes before the train was to leave, got on and was back in NY before I would have made it on the shuttle.

I had to go to Philly last week and took the Acela and it was great. Good wifi (free), comfortable seats, and no hassle. I have been flying on the Northeast corridor more of late (unless the weather is bad) but I think I'm going back to the train.