We Explored Iowa’s 2 Major Corn Railroads – What Happens After the Massive Corn Harvest

Across the cornfields of central Iowa, enormous harvesting machines are moving through one of the largest grain-producing regions in the United States. A powerful combine advances through the standing corn, removing ears from the stalks and separating millions of kernels inside its threshing system. Nearby, a tractor pulling a large grain cart moves into position. The combine extends its unloading auger, sending a continuous stream of golden corn into the cart while both machines keep moving across the field. This is Iowa, America's largest corn producing state. Now look at the map of Iowa. Vast cornfields cover much of the state, stretching across its flat farmland, especially in central, northern, and western Iowa. For generations, Iowa farmers have relied on the state's fertile soils and favorable climate to produce some of America's largest corn harvests. Each spring, as temperatures rise and the soil begins to warm, farmers head into the fields with massive planters, usually between April and May. Over the following months, warm summer days, long hours of sunlight, and roughly 30 to 40 inches of annual precipitation help their crops grow across millions of acres of farmland. By late September, those same fields begin to turn golden, signaling the arrival of harvest season. From October into November, Iowa enters its busiest harvest season. Every day, farmers move combines, grain carts, and trucks from field to field as corn is harvested across the state. Last year, Iowa farmers produced approximately 2.77 billion bushels of corn, the largest corn harvest in the state's history. That crop came from about 13.2 million harvested acres, with an average yield of roughly 210 bushels per acre. At that scale, harvest is not only a farming operation, it also creates an enormous transportation job, with billions of bushels needing to move from fields into grain elevators, rail terminals, and export routes. Trucks make constant trips between farms and nearby grain elevators, carrying freshly harvested corn from the fields to massive storage silos. Once the trucks arrive, the grain is weighed and tested for moisture before being unloaded into receiving pits. From there, conveyors and bucket elevators carry the corn into towering steel silos, where it can be stored until it is ready for processing or shipment to distant markets. But the journey does not end there. At grain terminals across Iowa, long strings of covered railroad hopper cars are positioned beneath industrial loading equipment. Thousands of bushels pour into each car. Powerful diesel-electric locomotives wait nearby, ready to pull enormous shipments away from the agricultural heartland. And two major railroad companies play a particularly important role in this system, Union Pacific and BNSF Railway. Together, they operate approximately 2,000 miles of track across Iowa, connecting farms, grain elevators, food processors, and other businesses with the country's larger transportation network. BNSF Railway operates one of the largest freight railroad networks in North America, stretching more than 32,000 miles across the continent. In Iowa alone, the company operates approximately 659 miles of railroad lines. Union Pacific operates one of the largest freight railroad networks in North America, stretching nearly 33,000 miles across 23 U.S. states. In Iowa alone, the company operates approximately 1,554 miles of railroad lines, more than twice the mileage operated by BNSF in the state. Now, where do these two railroads carry Iowa corn for export? To answer that, let's look at the map of Iowa. BNSF primarily moves Iowa grain west toward Pacific Northwest ports, while some shipments also move south toward Texas, where corn is used as an important feed source for the state's large cattle industry. While Union Pacific connects Iowa with western export routes as well as major Gulf Coast gateways, giving farmers access to overseas buyers in Asia and other global markets. BNSF and Union Pacific are especially important to Iowa agriculture because they give grain producers access to distant feed markets, processors, river terminals, and export ports at a cost that trucks alone could not match. In 2022, about 12.3 million tons of farm products moved outbound from Iowa by rail in roughly 120,000 carloads, while food and related products added another 20.7 million tons of outbound Rail also helps keep transportation costs under control. One covered hopper can carry about 3,500 to 3,900 bushels of grain, roughly the equivalent of four semi-trailer loads. For Iowa's corn industry, that means BNSF and Union Pacific are not just transportation companies. They are part of the economic system that allows farmers and grain elevators to move huge volumes efficiently and reach markets far beyond the state. If you enjoyed this video, subscribe for more stories about American agriculture, railroads, and the industries that connect them.