Caption: CN SD70M-2 brings in the daily northbound freight train from the United States across the ancient swing bridge over the historic Canadian ship lock canal at Sault Ste. Marie, Ontario. Built in the 1890s to allow ship traffic on the lakes to pass between Lake Superior and Lake Huron, this lock now only handles smaller recreational traffic, with today's modern massive lake freighters using the newer, larger locks on the American side of the river at Sault Ste. Marie, Michigan.