As of 2015, Union Pacific's stock has been falling due to weak coal carloads and declines in crude oil prices. As a result, Union Pacific stock has been subject to a series of downgrades by analysts.
Weak coal prices in the global market and the relative strength of the U.S. dollar have led to sharp decreases in railroads’ export coal carloads. Union Pacific’s coal carloads, which made up 17 percent of its revenues in 2014, have fallen as a result of these trends. The declining cost of crude oil has also hurt Union Pacific's stock recently, although it should be noted that crude oil shipments only account for about two percent of Union Pacific’s volumes.