Intermodal rail volume rose 4.9% for the week ended Sept. 14 from the same week a year ago, the Association of American Railroads reported.
Traffic increased to 265,873 trailers and containers, AAR said in its weekly report.
Rail carload traffic rose 1.5% to 296,221 year-over-year, the rail trade group said.
Seven of the 10 carload commodity groups tracked by AAR posted increases, led by motor vehicles and parts, which jumped 14.4%. Commodities showing a decrease included grain, which fell 9.8%.
For the first 37 weeks of the year, U.S. railroads moved 9 million intermodal containers and trailers, up 3.7% from last year. Carload traffic dipped 1% to 13.4 million units.