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 Home Measuring just short of one hundred feet long, the 5900 series 2-10-4 type locomotives were the largest and heaviest steam locomotives in the Commonwealth. In the United States, locomotives of this wheel arrangement were known as "Texas" types, but in the 1930s, a competition conducted among Canadian Pacific employees resulted in the name "Selkirk" being selected, after one of the ranges of the Rockies through which these dozen impressive locomotives were in daily operation - Omer Lavallee.