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Why is the number of trains not a factor in determining vibration impact?

April 26, 2017determining Factor impact trains vibration

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Why is the number of trains not a factor in determining vibration impact?

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Human response to vibration is more closely related to the maximum vibration level than to the number of vibration causing events. The FTA guidelines do however have different standards for frequent vs. infrequent events. The Greenbush Line trains are in the infrequent category less than 70 trains per day.