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.rr <br /> The Impact7. <br /> Train Horn <br /> Decibel (a3A) Contour Map <br /> iG •, <br /> s 0. <br /> :r 1 <br /> 500' 1000' <br /> `0• <br /> f 0-d <br /> ' <br /> 500' <br /> V <br /> t Train Direction 4., <br /> Train <br /> Horn ' <br /> 90 Decibels and above .. <br /> 0 80 - 90 Decibels <br /> 'Over 80 Decibel ' area larger than 40 acres per crossing <br />