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| Re: Bellmouths and tunnel expansions (1264699) | |||
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Re: Bellmouths and tunnel expansions |
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Posted by 3-9 on Tue Dec 17 05:46:32 2013, in response to Re: Bellmouths and tunnel expansions, posted by renee gil on Thu Sep 12 14:14:55 2013. Sorry for necroposting, but while catching the Holiday train at 2nd Ave I got a better look at the 2nd Ave/Houston St station at the 2nd Ave end, from the street entrance to the platform. While doing an approximate measurement of where the underground structures are relative to the street above, I noticed some interesting details.1) The beams supporting the low ceiling at the 2nd ave end of the station are different from the beams supporting the low ceilings everywhere else in the station. Everywhere else, the beams are perpendicular to the tracks, but at the 2nd Ave end, the beams are mostly parallel except for some crossbeams. In fact, the distance between those crossbeams are about the width of a trackway. If you assume those are provisions for the trackways for the SAS, it would make for 2 pairs of tracks with a single platform in the middle and possibly 2 side platforms (like 34th St 7th Ave and 8th Ave). The space for the center platform did look kind of narrow though. 2) That bit of low ceiling at the 2nd Ave end is right underneath 2nd Ave, based on my estimates, right where you would put the tracks for the SAS. The raised ceiling, OTOH, would be under the sidewalk or even further. 3) It looks like there used to be stairs that went from that center platform provision to the F platforms. I can't tell if the stairs did a 90-degree turn on the way up or if they went straight. Knowing that would tell whether the stairs (if they were ever there) were part of the SAS provision, or if they were added afterwards. All this brought up another question: assuming the low ceiling is where the tracks for the SAS is supposed to go, does this mean that the high ceiling was supposed to be the underside of the uptown "local" platform? It's pretty wide for that, and maybe a bit high. |
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