More than 90 percent of the over 35 million corridor trips have origins or destinations in Chicago or St. Louis. A more balanced transportation system in the corridor would provide travelers with greater mobility options. To achieve this, either a new transportation mode must be introduced, or improvements to an existing, less frequently used intercity passenger rail mode must be made. Reduced travel time, increased service reliability, and enhanced safety would attract travelers from automobile and air travel to a new or improved rail mode of transportation.