Milwaukee Road and Soo Line historically had numbered subdivisions, which were renumbered over the years as operating divisions were consolidated. Named subdivisions were adopted after Soo Line acquired the Milwaukee Road, and are used here. Certain lines abandoned longer ago are identified differently.
Some subdivisions were sold to other railroads, some segments abandoned prior to sale.
Elgin Subdivision (Chicago-Elgin)
Davenport Subdivision (Elgin-Savanna)
Abandoned Lines
Third Subdivision (Rockford-Delmar)
Fourth Subdivision (Savanna-Moline)
C&M Subdivision (Chicago-Rondout)
C&M Subdivision (Rondout-Milwaukee)
Fox Lake Subdivision (Rondout-Fox Lake)
Lines Sold to Wisconsin & Southern Railroad (Short Line Operator)
Fox Lake Subdivision (Fox Lake-Janesville)
Milwaukee Subdivision (Milwaukee-Horicon)
Cambria Subdivision (Horicon-Cambria-Portage)
Oshkosh Subdivision (Horicon-Oshkosh)
Markesan Subdivision (Brandon-Markesan)
Mayville Spur (Iron Ridge-Mayville-Fond Du Lac)
Abandoned Lines
Berlin Branch/North Lake Branch/Winneconne Branch
Lines Sold to Wisconsin Central, now CN
Plymouth Subdivision (Milwaukee-Hilbert-Green Bay)
Manitowoc Subdivision (Hilbert-Menasha-Appleton)
Line Sold to Wisconsin & Southern Railroad (Short Line Operator)
Plymouth Subdivision (Saukville-Kiel)
Lines Sold to Escanaba & Lake Superior Railroad (Short Line Operator)
Main Line (Green Bay-Channing)
Menominee Branch (Crivitz-Marinette)
Watertown Subdivision (Milwaukee-Portage)
Tomah Subdivision (Portage-La Crosse)
River Subdivision (La Crosse-St. Croix)
Joint Line (St. Croix-St. Paul)
M&P Subdivision (Madison-Portage)
Line Sold to Wisconsin Central, now CN
Valley Subdivision (New Lisbon-Bradley-Woodruff)
Line Sold to Wisconsin & Southern Railroad (Short Line Operator)
Watertown Subdivision (Watertown-Madison)
Abandoned Lines
Viroqua Branch/Chaseburg Branch
Chippewa Falls Branch/Menomonie Branch
Waukesha Line (Brookfield-Waukesha)
Janesville Subdivision (Davis Jct.-Janesville)
Waxdale Line (Racine-Waxdale-Kansasville-Elkhorn)
Lines Sold to Wisconsin & Southern Railroad (Short Line Operator)
Monroe Subdivision (Janesville-Monroe-Mineral Point)
Madison Subdivision (Janesville-Madison)
Prairie Subdivision (Madison-Prairie Du Chien-Marquette)
Sauk Subdivision (Mazomanie-Prairie Du Sac)
Waukesha Subdivision (Waukesha-Madison)
Elkhorn Subdivision (Elkhorn-Bardwell-Clinton Jct.)
Line Sold to UP
Beloit Branch (Clinton Jct.-Beloit)
Abandoned Lines
Racine & Southwestern (Rockton-Kittredge)
Rochelle & Southern (Davis Jct.-Oglesby)
Richland Center Branch/New Glarus Branch/Platteville Branch
Line Sold to Kankakee Beaverville & Southern Railroad (Short Line Operator)
Terre Haute Division (Chicago-Hooper-Danville-Terre Haute)
Line Sold to Indiana Rail Road (Short Line Operator)
Terre Haute Division (Terre Haute-Crane-Westport)
Abandoned Lines
Sullivan Branch (Blackhawk-Sullivan)
Abandoned Lines
Evanston Division (Chicago-Wilmette)