In 1869, the St. Paul and Sioux City Railroad completed construction of the track through Mankato In 1880, the St. Paul and Sioux City Railroad was consolidated with several other railroads to form the Chicago, St. Paul, Minneapolis and Omaha Railway. This railroad was ccontrolled by Chicago & North Western after 1882 and was operated as a part of C&NW system. The corporation lasted until 1957, and its official identity was maintained until 1972 when it was absorbed into the C&NW. Union Pacific merged with the C&NW in 1995.