The Kankakee Belt Route is the nickname for the Illinois Division of the New York Central Railroad, which extended from South Bend, Indiana, through Kankakee, Illinois, and westward to Zearing, Illinois. This line was sometimes referred to as the "3 I Line", in reference to a corporate predecessor, the "Indiana, Illinois & Iowa Railroad".That portion of the line west of Kankakee to Moronts, Illinois, roughly parallels the Illinois River in Northern Illinois and was used, in large part, to transport corn toward eastern markets. See Kankakee Outwash Plain