Milwaukee Road Archives  
Chicago, Milwaukee, St. Paul & Pacific Railroad Company

Milwaukee Public Library Milwaukee Road Archives 

University of Missouri Barriger Library CMC Collection  Milwaukee Road Historical Society 
  The official Milwaukee Road archives are at the Milwaukee Public Library, however, AFEs, legal, financial, and other aspects are with the Chicago Milwaukee Corporation archives at the Barriger Collection at the Mercantile Library, St. Louis, Missouri. The Milwaukee Road Historical Association maintains some materials. Links above.