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| Re: Second Ave Alignment Change (637280) | |||
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Re: Second Ave Alignment Change |
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Posted by SelkirkTMO on Sat Jun 21 01:14:32 2008, in response to Re: Second Ave Alignment Change, posted by RonInBayside on Sat Jun 21 00:56:54 2008. Well ... point of good sense ... even if you DON'T put the third track in, you at least EXCAVATE for it, and pull down the temp work when you can afford it. Because this appears to be a TBM job, you have a round horizontal hole. So ONCE you dig, you don't have the alternatives you did before of "close arrangement" for the future. Should the SAS become as heavily used as any OTHER 4-track subway line in Manhattan, they're already out the option since they're only building two tracks in the first place. When you have a limited railroad, you NEED options such as that third track.I'm sadly surprised at the fact that since they were going to dig ANYWAY, why not go with a large enough bore size to do stacked pairs like they did with the 60th Street tunnel, use the upper or lower half, or one side and just leave bare concrete shell for what will eventually need to be added? But by going with the smaller bore size for two tracks, that option (if ever undertaken) will be a bigger mess and expense than digging the 6th Avenue express dash. :( Somebody in management needs to talk to someone who actually RUNS the railroad and see why that provision was there in the first place. Given that SAS was designed as a two-tracker, that location having three tracks was apparently VERY significant! Only question is what possible benefit is there in foreclosing what may well be needed the day the line opens. And to "re-bore" at a later time will be a complete shutdown for that line to do. :( Maybe they can linoleum the station walls to save money, but messing with the bore is a really bad idea if the original designers put it in there in the first place for such a SHORT line. |
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