Editing 2-10-4 (section)

===Canada===
The Canadian Pacific (CP) [[Selkirk locomotive]]s were all built by [[Montreal Locomotive Works]] (MLW). The first 20 of these large engines were built in 1929, designated T1a class and allocated numbers 5900 to 5919. Their Canadian type name was after the [[Selkirk Mountains]] across which they were placed in service, the railway summit of which was located just inside the western portal of the [[Connaught Tunnel]] beneath [[Rogers Pass (British Columbia)|Rogers Pass]].<ref name=Atkins>{{cite book| first=C.P. | last=Atkins| title=Loco Profile 35: Canadian Pacific Selkirks| publisher=Profile Publications | location=Windsor, England| year=1973}}</ref>

[[File:Canadian Pacific Selkirk class 5927 takes on oil at the South Edmonton shops.jpg|thumb|Canadian Pacific T1c, 1957]]
MLW built another 10 of these successful locomotives for CP during November and December 1938, designated T1b class and numbered from 5920 to 5929. Modifications to the original design led to the T1b being 10 tonnes lighter while its operating steam pressure was increased from {{convert|275|to|285|psi|abbr=on}}.<ref name=Atkins/>

A further six Selkirks, classed T1c and numbered from 5930 to 5935, were delivered by MLW in 1949. They were the last [[standard gauge]] steam locomotives to be built in Canada for a Canadian railway. These were very similar to the T1b class, apart from a few refinements, which included two cross-compound air compressors to speed up recharging of the air brake system, while some small streamlining touches were not retained, such as the streamlined casing around the smokebox stack and the teardrop shape of the classification lights. In addition, the insides of the cabs were no longer insulated in the same manner as the previous versions, which had provided better cold-weather cab insulation and were better liked by crews. The last Selkirks were taken out of service in 1959. These were the most powerful steam locomotives in the [[British Empire]].<ref name=Atkins/>