Rail and intermodal traffic declined for the week ended Saturday from the same week last year, the Association of American Railroads said.
Rail intermodal volume dropped 2.1% year-over-year to 191,459 trailers and containers, AAR said in its weekly report.
Container volume dipped 1.4% to 149,347 units, while trailer volume fell 4.4% to 42,112 units.
Overall rail carload traffic dipped 0.1% from a year ago to 290,424 carloads, the group said.
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.