Shipment volume in the US by truck, rail, air, and barge plunged 7.9% in December 2019 compared to a year earlier, according to the Cass Freight Index for Shipments. It was the 13th month in a row of year-over-year declines, and the steepest year-over-year decline since November 2009, during the Financial Crisis:
The Cass Freight Index tracks shipment volume of consumer goods and industrial products and supplies by all modes of transportation, but it does not track bulk commodities, such as grains. As always when things get ugly, the calendar gets blamed - Christmas