Bruce Harmon/Trans Pixs
U.S. intermodal traffic rose 4.2% for the week ended Saturday from a year ago, the Association of American Railroads said.
Container traffic rose 7.2% to 216,217 units, while trailers fell 9.6% to 33,101, the rail trade group said in its weekly report.
Railroad carloads excluding intermodal increased 1.4% to 288,730 units according to the AAR report.
Railroad volume is considered an important economic indicator. Intermodal traffic, which tends to be higher-valued merchandise than bulk commodities, uses trains for the long haul and trucks for the shorter distance at either end of the trip.