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)
Main Line (Willard-New Castle)
Lake Subdivision (Youngstown-Painesville)
CT&V Subdivision (Valley Jct.-Cleveland)
Chicago Division (Pine Jct.-Garrett-Indiana State Line)
Chicago Division (Ohio State Line-Willard)
Cincinnati Terminal Subdivision
Indianapolis Subdivision (Hamilton OH-Indianapolis)
Decatur Subdivision (Indianapolis-Springfield)
Main Line (Newark-Columbus)
Midland Subdivision (Midland City-Columbus)
Lake Erie Subdivision (Newark-Sandusky)
Chillicothe Subdivision (Cincinnati-Chillicothe)
Parkersburg Subdivision (Chillicothe-Parkersburg)
Indiana Subdivision (Cincinnati-Washington IN)
Illinois Subdivision (Washington IN-East St. Louis)
Louisville Subdivision/Jeffersonville Subdivision (North Vernon-Louisville)
Springfield Subdivision (Shawneetown-Beardstown)
Toledo Subdivision (Cincinnati-Toledo)
Wellston Subdivision (Dayton-Wellston)
CL&W Subdivision (Bellaire-Warwick)
CL&W Subdivision/Cleveland Subdivision (Sterling-Lorain/Cleveland)