Lines are grouped into historic operating divisions. As passenger service declined during the 1950's, many divisions were consolidated.
Main Line (Ansonia-Indianapolis)
Main Line (Indianapolis-Terre Haute)
Main Line (Terre Haute-Alton/East St. Louis)
Cairo Branch (Danville-Paris-Cairo)
Terre Haute Division (Terre Haute-Evansville)
Main Line (Kankakee-Templeton)
Main Line (Lafayette-Indianapolis)
Main Line (Indianapolis-Cincinnati)
Michigan Branch (Goshen-Anderson-North Vernon)
Aurora Branch/Trafalgar Branch
Peoria & Eastern Line (Indianapolis-Danville)
Peoria & Eastern Line (Danville-Peoria)