For what it is worth, here is a rough history as far as I can figure
out, of how it all unfolded. With reference to the MIS Summary posted
earlier in this thread:
0. For some yet to be explained reason which possibly, among other
things, involved internecine bickering between MTA, NJT and PA, NJT did
not choose the so called Alternative G which according to the MIS report
had the most favorable returns. This is not to say that there may be
perfectly good reasons for that, but such has not been publicly shared
by NJT or PANYNJ so far. This is still a matter of hot debate since
PANYNJ has so far tried to bury the full report claiming it was a draft
and not subject to release through the NJ or NY equivalent of the
federal Freedom of Information Act. But recently the NJ Legislature has
subpoenaed that and other PA documents, so we will see what happens.
1. initially NJT proposed doing Alternative P which was to build a clone
of the ESA station under GCT, under NYP fed through the new tunnels.
Afterall the primary consultant for both was Parson Brinkerhoff (sp?).
Then they found that if they did so it would be impossible to connect
the new tunnels to the existing station. Similarly the ESA tracks do not
connect to the existing GCT tracks.
2. So they displaced the new station to the north side of NYP and moved
it under 34th St keeping both the depth and the width the same. They
threw in a connection from the new tunnels to the existing station too.
This is what the original DEIS was based upon.
3. Then they discovered that there is a bad fault line under Penn
Station and 34st St at the proposed depth which would destabilize stuff
above during construction. So they moved it a little deeper to avoid it.
4. This caused the approach tunnels to run smack dab into the 7
extension tunnels, so they moved it even deeper, which snapped the
connection to the existing station reducing utility of the project.
5. Meanwhile Manhattan Real Estate interests put their foot down
insisting that the station must fit within the building lines along 34th
St, which reduced the number of platforms by one at each level thus
reducing capacity though NJT claimed that it would not affect capacity,
mysteriously. This is what the Supplemental DEIS was based on.
6. Meanwhile the money spent on real estate acquisition, which was being
done by PANYNJ, spent the budget and the contingency and then some,
which set all sorts of alarm bells ringing all round, and Christie, in a
partly politically motivated and partly real fear of significant
overspending nixed the project.
In all this the pier line and retaining wall was a minor annoyance thing
at best, and would most likely would have been handled if the other
factors did not materialize as they did.
Now why did NJT go this route? Apparently because partly they wanted
their station to be closer to the subway stations rather than further
away which is what NYP South will be, if actually built, and partly
because they were trying to go it alone without any participation from
Manhattan interests, which bit them in their caboose anyway.
Amtrak's Gateway project is materially different in that its primarily
goal is to connect with the existing station and possibly build an
extension to it to the south of it in the so called Block 780. Indeed
even while ARC was being contemplated by NJT, Amtrak had insisted on
keeping easements available for what has come to be known as the Gateway
Project. The other significant difference is that NJT had insisted on
the gradient being less than or equal to existing gradient (1.98% AFAIR)
in the Hudson Tunnels. Amtrak has managed to get NJT to yield on that to
move it upto 2.05%, though they really want to go upto 2.5% but NJT is
baulking at that so far. But even with 2.05% they can make the Army Core
of Engineers and EPA dictated depth of the tunnel below the river bed
and yet make it upto the track level of NYP while avoiding the #7 tubes.
Still there is considerable uncertainty about what will happen with the
Block 780 plan as real estate realities strike again. Unless Amtrak is
able to get a coalition of Manhattan Real Estate interests to buy into a
consolidated plan it is doubtful that anything will get built there, and
without that Penn Station will remain hobbled for capacity. Building at
least one tunnel irrespective of that is probably still a good idea to
get some redundancy in.
Incidentally extension of the so called I Ladder at A interlocking in
NYP is budgeted as part of the funding from the $450 million grant for
the NJ HSR project. This would eventually be used to make the north side
platform tracks accessible from the Gateway Tunnels.
Source of these last pieces of information is from attending the two
sessions of TransAction 2012 in Atlantic City which was co-hosted by
Amtrak (Drew Galloway - NEC Capital Program) and NJ Transit on the
Gateway Project and the HSR Project in NJ. If you ask me to produce
citeable documents, I can't since they did not share any such that is
easily available on the web.
That is the very short version of this unfolding saga.....
Jishnu.