Lines are grouped into historic operating divisions. As passenger service declined during the 1950's, many divisions were consolidated.
Burlington Route historically named its subdivisions by the end points.
Chicago Subdivision (Chicago-Aurora)
Mendota Subdivision (Aurora-Galesburg)
Aurora Subdivision (Aurora-Savanna)
Chicago Subdivision/Branches (Aurora Area)
Lines Sold to Short Line Operator (ILLINOIS RAILWAY)
(Some segments abandoned prior to sale)
Montgomery & Streator Subdivision
Streator & Walnut Subdivision
Rockford & Flag Center Subdivision
Oregon & Forreston Subdivision
Abandoned Lines
Mendota & Denrock Subdivision
Shabbona & Sterling Subdivision
Paw Paw & Burgess Jct. Subdivision
Aurora Subdivision (Savanna-La Crosse)
St. Croix Subdivision (La Crosse-St. Croix)
via Joint Line (St. Croix-St. Paul)
Brookfield Subdivision (Galesburg-Quincy)
Barstow Subdivision (Galesburg-Savanna)
Peoria Subdivision (Galesburg-Peoria)
Yates City Subdivision (Buda-Yates City-Vermont)
Barstow Subdivision/Branches (Quad Cities Area)
Lines Sold to Short Line Operator (BURLINGTON JUNCTION RAILWAY)
(Some segments abandoned prior to sale)
Quincy & East Hannibal Subdivision
Abandoned Lines
Agnew & Denrock Subdivision
Lass & Ebner Subdivision
Galva & New Boston Subdivision
Fairview & Lewistown Subdivision
Ottumwa Subdivision (Galesburg-Burlington)
Beardstown Subdivision (Rio-Bushnell-Concord)
Beardstown Subdivision (Concord-Paducah)
Abandoned Lines
Beardstown & St. Louis Subdivision
via Joint Line (Alton-St. Louis)