The Northern Railway of Canada was a historical railway located in the province of Ontario, Canada. It was the first steam railway to enter service in what was then known as Upper Canada. It was eventually acquired by the Grand Trunk Railway, and is therefore a predecessor to the modern Canadian National Railway (CNR). Several sections of the line are still used by CNR and GO Transit.
Originally known as the Toronto, Simcoe and Huron, and then the Ontario, Simcoe and Huron, the aim was to provide a portage route from the upper Great Lakes at Collingwood to Toronto. The plan for the railroad was largely executed by Frederick Chase Capreol who was fired as manager of the company the day before the ground broke. Financial difficulties and a government bailout led to a reorganization of the company as the Northern Railway of Canada in 1859. The line saw three major expansions; North Grey Railway extended the original mainline to Meaford, the North Simcoe Railway ran to the port town of Penetanguishene, and the Muskoka Branch ran northeast to Gravenhurst. This last expansion would be the starting point for the Northern and Pacific Junction Railway, connecting to the Canadian Pacific Railway mainline outside of North Bay. In 1887, the Grand Trunk Railway (GTR) gained a controlling interest, and the takeover was formalized in January 1888.