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The Canadian National Class Z-4-a was a batch of nine electric "
boxcab A boxcab, in railroad terminology, is a term for an electric locomotive in which the machinery and cab (locomotive), crew areas were enclosed in a box-like superstructure. Deriving from "boxcar", the term mainly occurs in North America. The ter ...
" type locomotives built by
English Electric The English Electric Company Limited (EE) was a British industrial manufacturer formed after World War I by amalgamating five businesses which, during the war, made munitions, armaments and aeroplanes. It initially specialised in industrial el ...
for the Montreal Harbour Commissioners, later the National Harbour Board of Canada from 1924 to 1926. The Port of Montreal decided to de-electrify its railway system in 1940, and so in 1941 the fleet of locomotives was traded with
Canadian National Railway The Canadian National Railway Company () is a Canadian Class I freight railway headquartered in Montreal, Quebec, which serves Canada and the Midwestern and Southern United States. CN is Canada's largest railway, in terms of both revenue a ...
for seven steam switcher locomotives. They were given the classification Class Z-4-a by CN and renumbered. They would subsequently be renumbered in 1949 and finally 1969. Here they complimented the older GE built boxcabs, the class Z-1-a. Both boxcab types served the
Mount Royal Tunnel The Mount Royal Tunnel () is a rail transport, railway tunnel in Montreal, Quebec, Canada. The tunnel is the third longest in Canada, after the Mount Macdonald Tunnel and the Connaught Tunnel, and connects the city's Central Station (Montreal), C ...
route in Montreal for many years until retirement in June 1995.


See also

*
CN electric multiple unit The CN electric multiple units were a fleet of electric multiple unit (EMU) railcars built in 1952 by Canadian Car and Foundry (CCF) for the Canadian National Railway for use on the Deux-Montagnes line in Montreal. The cars remained in use until ...
Multiple unit sets used in the Mt Royal Tunnel * Canadian National Class Z-1-a earlier Mt Royal Tunnel boxcabs built by General Electric *
NZR EO class (1923) The NZR EO class of 1923 were electric locomotives used on the steep Otira to Arthurs Pass section of the Midland Line in New Zealand. They were primarily needed for pulling trains through the 1 in 33 grade Otira Tunnel which was too long and ...
smaller locomotives built for New Zealand in the same era


References

English Electric locomotives Canadian National Railway locomotives Electric locomotives of Canada Bo+Bo locomotives 3000 V DC locomotives Passenger locomotives Scrapped locomotives Boxcab locomotives Railway locomotives introduced in 1924 Standard-gauge locomotives of Canada {{Electric-loco-stub