UPDATE – Main Line – Menominee River to Ontonagon A new photograph and additional information about the Ontonagon depot has been added to the Main Line – Menominee River to Ontonagon page. A DSS&A train poses in front of the CM&StP, or MILW, Ontonagon, Mich., depot ca. the turn of the 20th Century. Photograph courtesy of the Roy Drier Collection - Michigan Technological University Archives and Copper Country Historical Collections. You Might Also Like UPDATE – Main Line – Menominee River to Ontonagon July 26, 2021 NEW – Reminders of the M&N Main Line – Schwartzburg to Hilbert June 1, 2020 NEW – Our 2021 Open House November 15, 2021