Tunnel Box

The entire Concrete Casing is supposed to be 25 feet tall with an 18 foot tunnel clearance.

But, won't there be a few feet of space between the bottom of the Concrete Casing and where the tracks will eventually be?

3.5' invert and roof (or some variation) + 18' clearance = 25' Seems reasonable.

jlr3266 wrote:3.5' invert and roof (or some variation) + 18' clearance = 25' Seems reasonable.

So what you are saying is that both the invert and roof are 3.5' each?

Thomas wrote:

jlr3266 wrote:3.5' invert and roof (or some variation) + 18' clearance = 25' Seems reasonable.

So what you are saying is that both the invert and roof are 3.5' each?

3.5 + 3.5 + 18=25

When Amtrak extends the Concrete Casing to the Penn Station Throat, will they have to dig up 10th Avenue in Manhattan, or can they just "underpin" 10th Avenue?

Thomas wrote:
Thus, is it likely for the next section of the Concrete Casing to begin construction later this year/ the beginning of next?

30% Design documents were submitted last week, 100% Design due in September.....

Thomas wrote:When Amtrak extends the Concrete Casing to the Penn Station Throat, will they have to dig up 10th Avenue in Manhattan, or can they just "underpin" 10th Avenue?

It will be cut-and-cover, so there will be some disruption.....

Thomas wrote:The entire Concrete Casing is supposed to be 25 feet tall with an 18 foot tunnel clearance.

But, won't there be a few feet of space between the bottom of the Concrete Casing and where the tracks will eventually be?

Are you asking about the vehicle clearance envelope? Or the overall interior dimensions?

Don31 wrote:30% Design documents were submitted last week, 100% Design due in September.....

This makes me assume that construction on the Concrete Casing Extension should begin by December or so.

Don31 wrote:Are you asking about the vehicle clearance envelope? Or the overall interior dimensions?

I am asking about both.

The pile of dirt just west of Secaucus is for a potential development there. Not sure it will ever happen, but someone has proposed putting a convention center there and the soil is for sealing the dump that's beneath the area. The curvature in the concepts for Gateway are relics of the ARC plan which required the tunnel to go below everything at PENN as well as miss the Hudson River bulkhead. In order to get that low and still have a grade that was acceptable the tunnel had to have a longer approach. No way to know what will happen with Gateway since that's not been designed yet as far as I know.

bleet wrote:The pile of dirt just west of Secaucus is for a potential development there.

But, does that block potential future construction of the Gateway ROW (or alignment)?

bleet wrote:The curvature in the concepts for Gateway are relics of the ARC plan which required the tunnel to go below everything at PENN as well as miss the Hudson River bulkhead. In order to get that low and still have a grade that was acceptable the tunnel had to have a longer approach.

I saw a recent Gateway Diagram that showed the new tunnels passing through the bulkhead.

bleet wrote:The pile of dirt just west of Secaucus is for a potential development there. Not sure it will ever happen, but someone has proposed putting a convention center there and the soil is for sealing the dump that's beneath the area. The curvature in the concepts for Gateway are relics of the ARC plan which required the tunnel to go below everything at PENN as well as miss the Hudson River bulkhead. In order to get that low and still have a grade that was acceptable the tunnel had to have a longer approach. No way to know what will happen with Gateway since that's not been designed yet as far as I know.

This pile of dirt i highly doubt is for any future convention center and what dump? This pile didn't start to appear till about 5 years ago. If it was for the convention center that was supposed to be built with the office towers and hotel on top of Secaucus juntion then it would'be there long before.

As for the curvature, im sure they are still using the plans for the NJ side, well since NJT had already started building the overpass for the future western portal on the nj side.

Steve F45 wrote:

bleet wrote:The pile of dirt just west of Secaucus is for a potential development there. Not sure it will ever happen, but someone has proposed putting a convention center there and the soil is for sealing the dump that's beneath the area. The curvature in the concepts for Gateway are relics of the ARC plan which required the tunnel to go below everything at PENN as well as miss the Hudson River bulkhead. In order to get that low and still have a grade that was acceptable the tunnel had to have a longer approach. No way to know what will happen with Gateway since that's not been designed yet as far as I know.

This pile of dirt i highly doubt is for any future convention center and what dump? This pile didn't start to appear till about 5 years ago. If it was for the convention center that was supposed to be built with the office towers and hotel on top of Secaucus juntion then it would'be there long before.

As for the curvature, im sure they are still using the plans for the NJ side, well since NJT had already started building the overpass for the future western portal on the nj side.

This dump...
http://meri.njmeadowlands.gov/mesic/sit ... andfill-2/" onclick="window.open(this.href);return false;
This convention Center...
http://esecaucus.com/2012/06/parking-co ... anka-site/" onclick="window.open(this.href);return false;

Not saying any of this is going to happen but it has been discussed...

New tracks to the South and North of the current alignment? New Swift?