corporation created by the Canadian government in 1918 to operate a number of nationalized railroads (including the old Grand Trunk lines, the Intercolonial Railway, the National Transcontinental Railway, and the Canadian Northern Railway) as one of Canada's two transcontinental railroad systems. Headquarters are in Montreal.

In its early years Canadian National engaged in a fierce competitive struggle with the privately owned Canadian Pacific Railway Ltd. This ended with the Canadian National–Canadian Pacific Act in 1933, which directed the railways to cooperate by eliminating duplication of services. In 1978 Canadian National's passenger services were taken over by VIA Rail Canada (VIA Rail Canada, Inc.), a crown corporation set up to operate all Canadian passenger services except commuter services. After the government privatized Canadian National in 1995, the railroad acquired all the stock of the Illinois Central Railroad in 1999, thereby forming a rail network that reached from the Gulf of Mexico (Mexico, Gulf of) to the Atlantic and Pacific coasts of Canada. In 1998 an alliance with Kansas City Southern Railway extended CN's lines into Mexico.

Canadian National's transcontinental line extends from several cities on Canada's east coast to Vancouver and Prince Rupert, British Columbia, in the west. CN ships coal, forest products (including lumber and newsprint), chemicals, petroleum products, automotive parts and products, and agricultural goods. In 1973–75 the company built Toronto's CN Tower (Toronto) (opened 1976), which remained the world's tallest freestanding structure until 2007. Ownership of the CN Tower transferred to the Canadian government in 1995.