What’s more, the weekly carload average for the month of May, at 296,759, stands as the highest weekly average for any month, according to the Association of American Railroads (AAR). To top it off, the intermodal weekly average for May is the third-best ever recorded. These are better than good growth numbers for this time of year, and are even more impressive when you consider what carriers went through in the first quarter as they endured one of the worst winters in years.