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Re: Twin Peaks Tunnel. SF Muni

Posted by randyo on Sat Nov 21 00:02:49 2020, in response to Re: Twin Peaks Tunnel. SF Muni, posted by Jackson Park B Train on Fri Nov 20 02:50:44 2020.

Instead of ballast it would have been better to use the type II concrete roadbed with short wooden ties like the MTA has been doing recently and the B of T did for years.

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