A hefty flagoid presented as a Canadian National Railways ferry flag appeared on eBay earlier this year.
Light blue field, white linked "CN" initials (company brand) between two narrow horizontal stripes, white, running parallel to the flag’s edges.
From the description: "This great vintage sign was on the Canadian National train ferry that went from Port Huron, Michigan to Sarnia, Ontario in Canada. It is steel and weighs appx. 175 pounds, with some rust spots as you can see in the pics. It measures 43 1/2 inches wide and 34 inches high. There are 4 u-bolts on the back where it would fasten to the ship."
CN logo history page: the present one was designed by Allan Fleming in The above ferry service was first organized in 1859 by the Grand Trunk Railway (a rival tunnel was already opened in 1891). Once nationalized, GTR became part of Canadian National Railways (founded 1918 by the government) in 1923. The ferry was discontinued in 1994 when a new tunnel was about to be opened. The "CN" logo places the first possible use of the flag in 1960.