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The Sioux was a named passenger train of the Milwaukee Road

Chicago, Milwaukee, St. Paul and Pacific Railroad

The Milwaukee Road, officially the Chicago, Milwaukee, St. Paul and Pacific Railroad , was a Class I railroad that operated in the Midwest and Northwest of the United States from 1847 until its merger into the Soo Line Railroad on January 1, 1986. The company went through several official names...

 that operated between Chicago

Chicago

Chicago is the largest city in the US state of Illinois. With nearly 2.7 million residents, it is the most populous city in the Midwestern United States and the third most populous in the US, after New York City and Los Angeles...

, Madison, Wisconsin

Madison, Wisconsin

Madison is the capital of the U.S. state of Wisconsin and the county seat of Dane County. It is also home to the University of Wisconsin–Madison....

, and Rapid City, South Dakota

Rapid City, South Dakota

Rapid City is the second-largest city in the U.S. state of South Dakota, and the county seat of Pennington County. Named after Rapid Creek on which the city is established, it is set against the eastern slope of the Black Hills mountain range. The population was 67,956 as of the 2010 Census. Rapid...

, via Prairie du Chien, Wisconsin

Prairie du Chien, Wisconsin

Prairie du Chien is a city in and the county seat of Crawford County, Wisconsin, United States. The population was 5,911 at the 2010 census. Its Zip Code is 53821....

 and northern Iowa

Iowa

Iowa is a state located in the Midwestern United States, an area often referred to as the "American Heartland". It derives its name from the Ioway people, one of the many American Indian tribes that occupied the state at the time of European exploration. Iowa was a part of the French colony of New...

. The train operated coaches, diners and sleeping cars though most of its history.

In the latter years of the 1950s, the Sioux operated a non-stop service between Chicago's Union Station and Madison, Wisconsin. On that route, the train included a dining car serving breakfast, and a first-class parlor car. West of Madison the train carried a sleeping car and coaches. West of Madison it also operated as a mail train, making frequent stops. The train crossed the Mississippi River on the Pile–Pontoon Railroad Bridge.

On October 1, 1951 the train was cut back to a Chicago to Canton, South Dakota

Canton, South Dakota

Canton is a city in and the county seat of Lincoln County, South Dakota, United States. The city was named by Norwegian settler and former legislator James M. Wahl...

, service with prepaid taxi connections to nearby Sioux Falls

Sioux Falls, South Dakota

Sioux Falls is the largest city in the U.S. state of South Dakota. Sioux Falls is the county seat of Minnehaha County, and also extends into Lincoln County to the south...

. In 1960 the train was further cut back to a Chicago to Madison coach service. The train ceased operation on May 1, 1971, when Amtrak

Amtrak

The National Railroad Passenger Corporation, doing business as Amtrak , is a government-owned corporation that was organized on May 1, 1971, to provide intercity passenger train service in the United States. "Amtrak" is a portmanteau of the words "America" and "track". It is headquartered at Union...

assumed responsibility for providing a national rail service.