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In page Minister of Transport (Canada):

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In 1867, the Canadian Constitution under section 92(10) established federal responsibility for land and sea transportation between provinces and internationally. Most transportation duties and powers were placed under the Minister of Public Works,[1] with responsibilities for ports and harbours going to the Minister of Marine and Fisheries[2]. In 1879, the Department of Public Works was divided in two, with powers and duties over rail and inland sea transport going to the newly formed Minister of Railways and Canals.[3] The Minister of Railways and Canals was one of the most important cabinet posts because of the importance of railways to the economic development of Canada, with three Prime Ministers assuming the position either before or during their premiership.