Re: Strange Acoustical Resonances Gives Current Subway Cars an R9 Bearing Whine Sound at Union Square (1507989) | |||
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Re: Strange Acoustical Resonances Gives Current Subway Cars an R9 Bearing Whine Sound at Union Square |
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Posted by Joe V on Sat Mar 23 21:33:34 2019, in response to Re: Strange Acoustical Resonances Gives Current Subway Cars an R9 Bearing Whine Sound at Union Square, posted by heypaul on Sat Mar 23 21:27:26 2019. I hear that sound all the time on NJT and Amtrak, and in the same places. The fine grooves improve traction. |