From Wisconsin Department of Transporation:

For the first time in its history, Amtrak’s Hiawatha Service between Chicago and Milwaukee, has a ridership that surpassed 800,000 in 2011. The year-end numbers put ridership at 823,163. According to the Wisconsin Department of Transportation, that is a nearly four percent increase from 2010 when ridership totaled 792,848.

Amtrak’s Hiawatha Service provides seven round-trips Monday through Saturday and six round-trips on Sunday.Train stops include the Milwaukee Intermodal Station; Milwaukee Airport Rail Station at General Mitchell International Airport; Sturtevant, near Racine; Glenview, Ill., and Chicago’s Union Station. A one-way trip from Milwaukee to Chicago, approximately 86 miles, takes about 90 minutes.

In addition to the 2011 calendar year record, monthly Hiawatha Service ridership records were set in every month but August of last year. According to Amtrak’s 2011 fiscal year data, the Hiawatha Service is the busiest Amtrak corridor in the Midwest and the sixth busiest in the country.