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 NEW – Our 2021 Open House November 15, 2021 Update – Railroad History – Menominee River to Ontonagon May 18, 2020 UPDATE – Historic M&N December 25, 2023