Rail carload and intermodal traffic fell for the third week of December compared with the same week last year, the Association of American Railroads said Thursday.
Intermodal traffic declined 1.8% to 229,695 trailers and containers, AAR said in its weekly report.
Container volume fell 2.3% to 175,833 units, while trailers dipped 0.2% to 53,862units.
Overall rail carload traffic rose 3.2% from a year ago to 327,876 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.