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Re: Twin Peaks Tunnel. SF Muni

Posted by Stephen Bauman on Mon Nov 23 07:22:39 2020, in response to Re: Twin Peaks Tunnel. SF Muni, posted by randyo on Sun Nov 22 17:29:53 2020.

using cushioned tie plates

One problem is that the cushioning becomes brittle, looses its elasticity, and hence its noise elimination capability. The effectiveness of the cushioning is much less than either the concrete or rock ballast. It's not replaced, so the noise returns to injurious levels.

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