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| Re: Twin Peaks Tunnel. SF Muni (1561910) | |||
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Re: Twin Peaks Tunnel. SF Muni |
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Posted by randyo on Mon Nov 23 01:15:13 2020, in response to Re: Twin Peaks Tunnel. SF Muni, posted by Olog-hai on Sun Nov 22 18:26:00 2020. IMHO, the ties imbedded in concrete last longer and require less maintenance that ballast and definitely last longer since the iND’s roadbed is pretty much completely intact as opposed to the older portions of the IRT which has had the ballast replaced several times. The initial higher cost would be offset by not having to replace the roadbed every so often. |
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