Question: The Alberta Coal Branch is the name given to a segment of the Canadian National Railway, a Canadian Class I freight railway headquartered in Montreal, Quebec that serves Canada and the Midwestern and Southern United States, having been a Canadian Crown corporation from its founding to its privatization in which year?
Sentence (from "Rail transport in Canada"): There are two major publicly traded transcontinental freight railway systems, Canadian National and Canadian Pacific.
Relevant evidence: No