Lines are grouped into historic operating divisions. As passenger service declined during the 1950's, many divisions were consolidated.
Main Line (Chicago-Whiting)
Main Line (Whiting-Tolleston)
SC&S Branch (Colehour Jct.-Hegewisch-Bernice)
Main Line (Chicago-Bernice)
Main Line (Tolleston-Fort Wayne)
Butler Branch (Logansport-Butler)
Main Line (Indiana)
Main Line (Michigan)
Main Line (Bernice-Logansport)
Main Line (Logansport-Marion-Union City)
Effner Branch (Logansport-Effner)
South Bend Branch (Logansport-South Bend)
Muncie Branch (Muncie-Converse)
Richmond Branch (Anoka-Kokomo-New Castle)
Fort Wayne Branch (Fort Wayne-Decatur-Richmond)