Average weekly carloads on U.S. railroads in August 2009 (279,046) were more than 15,000 carloads higher than in July 2009 and higher than any previous month in 2009, though seasonal factors account for some of that increase — note the increase in August each year in the chart at right (Coal mines, for example, often undergo maintenance during July and ramp back up in August.) The last two weeks of August saw higher U.S. carload traffic than any previous two-week period in 2009.
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