Answers: Amtrak is pretty much it. It no problem is the only national holder that operates adjectives over the country and I believe that the regional carriers approaching you mentioned (NJ Transit, SEPTA, MARC, MTA, BART, etc.) only serve a few states at most (some of late a local region like BART).
Yep, thats just about it.
The biggest in vocabulary of miles as far as I know is the Alaska RR but it is still in one state.
And seasonal on most of their routes.
No.
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