The Gateway Eastern Railway (reporting mark GWWE) is a railroad subsidiary of the Kansas City Southern Railway (KCS), owning a 17-mile (27 km) main line between East Alton and East St. Louis, Illinois, United States. Originally created in 1994 as a subsidiary of the Gateway Western Railway, which acquired the East St. Louis-Kansas City line of the Chicago, Missouri and Western Railway in 1990, it was acquired by KCS along with its parent in 1997.