Exiting CN’s St. Clair Tunnel By Angela Cotey | November 11, 2022 | Last updated on August 7, 2025 Email Newsletter Get the newest photos, videos, stories, and more from Trains.com brands. Sign-up for email today! Get Updates In a view from the head end, an eastbound train led by St. Clair Tunnel Co. electrics exits Canadian National’s Port Huron, Mich.–Sarnia, Ont., St. Clair Tunnel in 1958. Jim Davis photo Share this article Print Facebook