Freight railroads are specialized rail systems designed to transport goods and materials over long distances. They use freight cars, which are built to carry various types of cargo, including bulk commodities like coal and grain, as well as manufactured products. This mode of transportation is efficient and cost-effective, making it a vital part of the supply chain in many industries. In the United States, major freight railroad companies, such as Union Pacific and BNSF Railway, operate extensive networks that connect cities and regions. These railroads play a crucial role in the economy by facilitating trade and reducing road congestion, contributing to a more sustainable transportation system.