The Trans-Canada Network was the principal service of the CBC and focused more on serious programming such as news, public affairs, classical music and educational programming while the Dominion Network carried lighter, more commercial fare. However, both networks aired commercials.
While the Dominion Network was made up almost entirely of privately owned affiliates (with the exception of the flagship station CJBC in Toronto), most Trans-Canada Network stations were owned by the CBC. In some smaller communities, a private station would be required to air several hours a day of Trans-Canada Network programming.
In 1962 the Dominion Network was dissolved and the Trans-Canada Network became known simply as CBC or CBC Radio. Over the next decade the CBC established a new second English-language network of FM stations that, in 1975, became officially known as CBC Stereo to distinguish it from the AM CBC Radio network. In 1997, as most CBC Radio stations had moved to FM, the networks were redesignated CBC Radio One and CBC Radio Two.