Around 1950, Chicago & Eastern Illinois changed from named districts to named subdivisions. And the Monon Route used numbered subdivisions. In 1969, Louisville & Nashville acquired the eastern portion of Chicago & Eastern Illinois, as a condition for Missouri Pacific acquiring the rest of that railroad. And in 1971, Louisville & Nashville acquired the Monon Route. Subdivisions with Louisville & Nashville were larger than subdivisions on most railroads, but subdivisions were viewed with less importance.
Woodland Subdivision (Woodland Jct.-Danville)
CED Subdivision (Danville-Evansville)
Abandoned Lines
Brothers Subdivision/Judyville Subdivision
Brazil Subdivision/Mt. Vernon Subdivision
Chicago Attica & Southern Railroad
Chicago Attica & Southern/Momence Branch
Elsdon Subdivision (Chicago-Munster)
Monon Subdivision (Munster-Lafayette)
Monon Subdivision (Lafayette-Cloverdale-Bloomington)
Hoosier Subdivision (Bloomington-Mitchell-Louisville)
Medaryille (Michigan City) Branch (Monon-Medaryille-Michigan City)
Monticello (Indianapolis) Branch (Monon-Monticello-Indianapolis)
Abandoned Lines
Line Sold to Evansville Western Railway (Short Line Operator)
Evansville Division (Evansville-Okawville-East St. Louis)
Earlier Abandoned Lines
O'Fallon Branch (Belleville-O'Fallon)