On a commodity basis, corn, dried distillers grains and soybeans are the most reliant on rail transportation, while wheat and sorghum are more likely to travel by vessel. In total, 54 percent of coarse grains and oilseeds travel by rail, 34 percent by vessel, 11 percent by truck and 1 percent by other means. As a quick reminder, Mexico is the largest export market for U.S. corn, distillers grains and rice. Mexico is the second-largest export market for wheat and soybean meal.
Beyond coarse grains and oilseeds, the other 87 percent of agricultural trade between the U.S. and Mexico is significantly more dependent on truck transit, with 78 percent of shipments occurring by truck, 15 percent by rail, 5 percent by vessel and 2 percent by other means. The products that ship by truck tend to be value-added, perishable and in some cases, seasonal. Mexico is the largest export market for U.S. dairy, poultry and eggs. It is the second-largest market for U.S. pork and fresh fruit and the third-largest export market for beef