Example of this: Boston to Portland, Maine.
Now, it would be nice if the Feds were willing to say "If a line going from state A to state C passes through state B and states A and C want it, then A and C can get the project if B is only marginally involved, whether or not B supports". I wish..
The HSR plan that goes to Atlanta is another possible case: VA and NC are on board, and I think you could get GA on board. SC, on the other hand, gets virtually no benefit from such a project compared to everyone else. It feels like giving Delaware a veto over the Acela.
Of course, it's also a shame that, if MA and ME felt strongly enough about it, that they couldn't just do a backwards deal with the Feds to cover the cost in their states and then have them buy the linking track in NH and do that themselves. Granted, I'm all too familiar with the political issues of that ("You're building something just barely outside our state! How dare you!"), but still...
Edit: This is actually one advantage of declaring a "national system" like Amtrak started with: You get a partial end-run on the states on at least some routings.
Edited by Anderson, 24 July 2011 - 10:40 PM.