Lines are grouped into historic operating divisions. As passenger service declined during the 1950's, many divisions were consolidated.
Altenheim Subdivision (Chicago-Forest Park)
Blue Island Subdivision (Chicago-Blue Island)
Barr Subdivision (Blue Island-Pine Jct.)
Lake Subdivision (South Chicago-Pine Jct.)
Chicago Heights Subdivision (Blue Island-Chicago Heights)
Chicago Division (Pine Jct.-Garrett-Ohio State Line)
Indiana Subdivision (Cincinnati-Washington IN)
Illinois Subdivision (Washington IN-East St. Louis)
Louisville Subdivision/Jeffersonville Subdivision (North Vernon-Louisville)
Springfield Subdivision (Shawneetown-Beardstown)
Indianapolis Subdivision (Hamilton OH-Indianapolis)
Decatur Subdivision (Indianapolis-Springfield)