The Mesabi Division file contains clearance diagrams for 10 railway line segments divided at Minneapolis Junction, Minnesota; Coon Creek, Minnesota; Boylston, Minnesota; Duluth, Minnesota; Cass Lake, Minnesota; Brookston, Minnesota; Kelly Lake, Minnesota; Gunn, Minnesota; Virginia, Minnesota; Saint Cloud, Minnesota, Brook Park, Minnesota; Sauk Centre, Minnesota; Cass Lake, Minnesota; Allouez, Wisconsin and Saunders, Wisconsin. Individual segment diagrams appear to have been updated in the period between 1957 and 1969.