United States Department of Transportation
i
Noise Test-Corrugated Rails Washington Metropolitan Area Transit Authority: Letter Report
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1981-12-31
[PDF-3.76 MB]
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Abstract:Noise and ground-borne vibration level measurements were made on a section of the Huntington subway route of the Washington Area Metropolitan Transit Authority (WMATA). Measurements were made before, in between, and after a WMATA sponsored rail grinding operation to eliminate corrugations from a section of rails between Foggy Bottom and Rosslyn subway stations. In-car acoustic measurements showed a 12-19 db noise reduction as a result of the rail grinding operations. This large amount of noise reduction was achieved partly because the rail test section between Foggy Bottom and Rosslyn subway stations had particularly rough rail corrugations before grinding resulting in high in-car noise levels compared to other parts of the WMATA system. The large reduction in levels probably would not be realized in other parts of the system where the rails were not as badly corrugated. The largest noise reduction took place when the field side of the rails were ground. No significant reduction was noted in the ground-borne vibration levels measured at the surface on NW I street as a result of rail grinding operations.
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