Construction of the Canso Causeway , which opened in 1955 , saw the Canadian National Railway mainline from Truro-Sydney being diverted from Linwood to an alignment north through Havre Boucher and Cape Jack , following the Strait of Canso to the causeway .
The construction of the Canso Causeway , which opened in 1955 , saw the Canadian National Railway mainline from Truro-Sydney diverted from Linwood north through Havre Boucher and Cape Jack , before following the Strait of Canso to the causeway .