What will happen to when one or both of the Hudson tunnels needs to be shut down?
There will be no main line trains operating between NJ and New York if both tunnels are shut down.
If one tunnel is shut down, the speculation is Amtrak will operate about 2tph between NJ and NYP. NJT will operate 6tph adding up to the available 8 slots on an average.
The balance of 18tph during rush hour that NJT operates would probably get distributed to three turning points - Newark Penn, Hoboken and Secaucus in some feasible proportion.
Will NJ Transit stop operating trains into NYP?
Yes, if both tunnels are out, and so will Amtrak from the south/west (except for those that come in via the Empire Corridor, and from Boston/New Haven. See above.
No. If one tunnel is open.
Could Amtrak use the PATH tracks?
No.
Will LD trains be stopped in NJ with PATH transfer?
This was discussed at length in a previous thread. If both tunnels are out, the general consensus was that LD trains will be terminated in Philadelphia and turned there. Of course the LSL can still continue to run to NYP.
If one tunnel is out, it should be possible to continue to operate the four LD trains that operate through NJ all the way to NYP.
Will there be through trains in NYP?
If both tunnels are out then No. Not between Washington and Boston. There could be through trains from the Empire Corridor to the north/est through NYP.
If only one tunnel is out there should be no problem operating an hourly through train through NYP.
Will Gov Christie finally see that Amtrak should get money?
He will be too busy polishing Trump's shoes and fetching Big Macs for him, to worry about such mundane things
More seriously, Christie (or the then NJ Governor, which by then is unlikely to be Christie) will need to come up with a couple of billion from somewhere. As usual probably both the NY and NJ Governor will go and milk their private piggy-bank - the PANYNJ some more.
They will find the money if the feds find their share.
One can rest assured that no bridge will get built across the Hudson below the George Washington Bridge except in the feverish fantasy of a few whose entire contribution to humanity appears to be to add confusion and waste everyone's time and drain scarce resou8rce by adding one more study by inserting nonsensical ideas into the discussion.
BTW the last choice "go around Manhatten and use the Hell gate bridge and East river tunnels" is absurd nonsense and shows a certain lack of familiarity with the geography of the New York area and what facilities exist.