Transtar's strength is rooted in its robust transport services. The company, which moves steel and other products on trains and barges, was formed in the 19th century to serve its parent, steelmaker U.S. Steel. Transtar works from start to finish, hauling raw materials such as iron ore, limestone, coal, and coke to sites; providing in-plant transportation; and moving finished products. In addition to handling transportation for U.S. Steel, Transtar transports freight for other steel companies and for customers in the coal, chemical, oil refining, and forest products industries. Transtar operates subsidiaries in Alabama, Pennsylvania, Illinois, Ohio, Michigan, and Texas.