The first 4-8-2s on the Canadian National were the class U-1-a Mountains delivered by Canadian Locomotive Company in 1923. They had 26x30-inch cylinders, a boiler pressure of 210 p.s.i., and 73-inch drivers. They weighed 354,300 pounds and put out 49,600 pounds of tractive effort. Elwin K. Heath took this photo of No. 6007, but the location and date are unknown.