See Grand Trunk Railway, "The Grand Trunk Railway (reporting mark GT) was a railway system that operated in the Canadian provinces of Quebec and Ontario and in the American states of Connecticut, Maine, Michigan, Massachusetts, New Hampshire, and Vermont. The railway was operated from headquarters in Montreal, Quebec, with corporate headquarters in London, England (4 Warwick House Street). It cost an estimated $160 million to build. The Grand Trunk, its subsidiaries, and the Canadian Government Railways were precursors of today's Canadian National Railways.
GTR's main line ran from Portland, Maine to Montreal, and then from Montreal to Sarnia, Ontario, where it joined its western subsidiary."
From Andrey Petrov, "Information from local library states that railway reached Gravenhurst in 1875 and 1888 GTR took over. So it dates between 1888 and 1923."
