If you could restore a defunct Amtrak route

The Inland Regionals are almost certain to reappear. The Vermonter is more than likely going to be extended back to the Montrealer, assuming the Canadians co-operate.

Maine keeps wanting thru-service to NY like the pre-Amtrak State of Maine, but track speeds are not competitive with interstates. NH wants their (pre-Amtrak and 1980 MBTA) service to Concord - demand was there in the Before Covid Time but without a state income tax there is now way to subsidize it.

I think they should reinstate The Cape Codder.

I believe any expansion into Montreal is on hold until the US and Canadian Border Patrols figure out a preclearance area in Montreal.

NH wants their (pre-Amtrak and 1980 MBTA) service to Concord - demand was there in the Before Covid Time but without a state income tax there is now way to subsidize it.

There is the property tax though, which is very high in NH. That HB 1432 bill that recently passed the NH House is the only thing that is threatening this project as of now, it is now up to the Senate to stop it from becoming law. For the passenger rail in NH itself, I would call for MBTA Commuter Rail service to Manchester and Amtrak to Lincoln, although the latter is unlikely as Amtrak only has plans of going as far as Concord.

Whether a revived Cape Codder runs from NYP or PVD, or you have to take the NEC to Boston and switch to an MBTA Cape Flyer isn't that important. But it needs to run at least daily in-season. Going east from PVD, the tracks are probably very slow at present. Maybe a Thruway bus should be used to seed demand.

As for BOS-Concord NH or BOS-Dover NH, those were never Amtrak or MBTA (except for the 1980 MBTA pilot service), didn't make it to A-day. NH is not going to totally overhaul their tax system just to fund a train.