http://feeds.sciencedaily.com/~r/sciencedaily/~3/Zm-_tFjVFa4/131204111920.htm

When attached to the wheels or the tracks of rail transit systems, vibration absorbers may reduce the noise from trains, bringing more peace and quiet to passengers and those who work or live near the tracks. In tests of two major metropolitan public rail systems, researchers say that vibration absorbers have a modest effect if any on wheel or rail rolling noise, but they may be effective in reducing wheel squeal.

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