How it started
Beginnings
Beginning in 1967, the different networks used by the two railway companies (CN Telegraph interchanged traffic with the Postal Telegraph Cable Company in the US while CPR Telegraphs networked with Western Union) were replaced by a single corporate entity. The two networks, former rivals, had been co-operating increasingly since the 1930s.
The next year, CNCP and TCTS (Trans Canada Telephone System, later Telecom Canada) published a brief, stating that they could work together in financing a Canadian telecommunications satellite so long as the federal government also had a stake in the project.
TelePost was a joint venture between CNCP and Canada Post that began in 1973. Using the service, an individual or company could compose a message electronically, then have it delivered by a postal carrier the next business day.
The last commercial telegraph operator with the company west of Thunder Bay (working in Regina) retired from the company in September 1971, with the six operators in Eastern Canada leaving soon after.
In 1973, CNCP added the Infodat data service, making it up to 90% cheaper to transfer teletype or computer data by using time-division multiplexing (TDM) and digital transmission.
From Wikipedia’s article on CNCP Telecommunications, shared under CC BY-SA 4.0.2