The BNSF Railway (reporting mark BNSF), formerly known as the Burlington Northern and Santa Fe Railway, is an American freight railroad company headquartered in Fort Worth, Texas; it is one of four remaining transcontinental railroads and one of the largest freight railroad networks in North America. Only the Union Pacific Railroad, its primary competitor for Western U.S. freight, is larger in size. The BNSF Railway moves more intermodal freight traffic than any other rail system in the world.