PATH loading gauge and tunnel diameter

Discussion relating to the past and present operations of the NYC Subway, PATH, and Staten Island Railway (SIRT).

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jsmyers
Posts: 208
Joined: Mon Feb 05, 2007 4:12 pm
Location: South Carolina

PATH loading gauge and tunnel diameter

Post by jsmyers »

Can somebody tell me what the PATH loading gauge is?

Similarly, after reading a few threads on the board, I think I understand that the uptown tunnels are narrower than the downtown tunnels (which are ~15'). How narrow are the uptown ones?

R36 Combine Coach
Posts: 5493
Joined: Mon Jun 09, 2008 8:51 pm

Re: PATH loading gauge and tunnel diameter

Post by R36 Combine Coach »

The Steinway Tuunel on the IRT #7 also have a narrow loading gauge, similar to the H&M.
Since my friend continues to chain smoke nonstop, she is probably an Alco.

Terry Kennedy
Posts: 143
Joined: Tue May 31, 2005 5:24 pm
Location: NYC

Re: PATH loading gauge and tunnel diameter

Post by Terry Kennedy »

jsmyers wrote:Similarly, after reading a few threads on the board, I think I understand that the uptown tunnels are narrower than the downtown tunnels (which are ~15'). How narrow are the uptown ones?
Here's an original drawing for the south midown tunnel (toward NYC). Click on the picture for the full-size version. The standard inner diameter (in a straight section of tunnel) is 18'. The effective diameter is smaller in the curved sections of tunnel.

Image

I have Jacob's original measurements and drawings for the various sections of the north midtown tunnel (toward NJ). Note that this tunnel has a variety of diameters and is finished in brick or concrete, not rings (the rings start just west of Morton St. in this tunnel). I don't have them online - post a reply here if you need me to dig them out,

jsmyers
Posts: 208
Joined: Mon Feb 05, 2007 4:12 pm
Location: South Carolina

Re: PATH loading gauge and tunnel diameter

Post by jsmyers »

Hmmm.

Thanks for the reply.

I was under the impression that the downtown tunnels were 15' ID, and that they were larger than the uptown tunnels.

That 18' ID tunnel would easily fit a train of the BMT loading gauge (not that there aren't other conflict points), correct?

What am I missing?

HBLR
Posts: 1035
Joined: Sun Aug 08, 2010 1:22 am
Location: Bayonne, NJ

Re: PATH loading gauge and tunnel diameter

Post by HBLR »

I believe they used the same iron sections from whatever furnace was doing the molds on the whole system. The rings are used to keep water out, not just the river, but groundwater in manhattan and the fill areas in Hudson county. I'm just guessing here, but I think the concrete/brick sections are put in where they are more concerned about the weight of stuff above slowly smushing the strong, but still ductile, iron rings. There's a lot of compromise here, as can be seen in the water damage at the ends of pavonia newport station, I'm pretty sure that area is fill.

That's just my 2¢. I could be totally wrong.
No I'm not a railroad professional, but that doesn't mean I can't provide first hand observational comments.

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