IL. Chicago Union Station Co, 1920 $500 Specimen 6 1/2% Series C Coupon Bond, XF. The Chicago Union Station Company is a wholly owned subsidiary of Amtrak that owns Chicago's Union Station, the largest intercity station in the Midwest, as well as the approach tracks. The Union Station Company was incorporated July 3, 1913, and organized November 19, 1913, to replace the old union station on the same spot. On May 7, 1915, the company was renamed to the Chicago Union Station Company. The station was opened May 16, 1925; viaduct construction for cross streets lasted into 1927. It was originally owned equally by four companies - the Pittsburgh, Fort Wayne and Chicago Railway and Pittsburgh, Cincinnati, Chicago and St. Louis Railroad (two Pennsylvania Railroad subsidiaries), the Chicago, Burlington and Quincy Railroad (Burlington Route), and the Chicago, Milwaukee, St. Paul and Pacific Railroad (Milwaukee Road) - and has been wholly owned by Amtrak since 1984.