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Re: Twin Peaks Tunnel. SF Muni

Posted by Stephen Bauman on Sat Nov 21 07:36:02 2020, in response to Re: Twin Peaks Tunnel. SF Muni, posted by randyo on Sat Nov 21 00:02:49 2020.

Concrete roadbeds are much noisier than rock ballast. There are maximum noise specs that might be exceeded.

There are also machines that can tamp rock ballast for much lower cost maintenance. NYCT didn't use them. Tokyo does. It's one of many areas where

the B of T did for years

NYCT has blinders regarding technology that came online after 1932.


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