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Seasonally Adjusted Transportation Data
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Rail freight intermodal traffic - Association of American Railroads
Seasonally-adjusted rail freight intermodal traffic - U.S. Department of Transportation, Bureau of Transportation Statistics (BTS) calculation from data collected by Association of American Railroads
Monthly rail carloads and intermodals are estimated by dividing the weekly sum by 7 (7 days in a week) and then summing for the number of days in the month (31 days for May, 30 days for June, etc.)