The American Association of Railroads (AAR) is a trade organization that represents the major freight railroads in the United States. Founded in 1934, its primary mission is to advocate for policies that promote the safety, efficiency, and sustainability of the rail industry. The AAR also conducts research and provides data on rail transportation, helping to inform both policymakers and the public. In addition to advocacy, the AAR develops standards for rail equipment and operations, ensuring consistency and safety across the industry. The organization also collaborates with other transportation sectors, including public transit and freight trucking, to enhance the overall efficiency of the transportation network in the U.S.