In 1929 the Canadian Pacific took delivery of ten class H1a Hudson (4-6-4) type locomotives from Montreal Locomotive Works. With 75-inch drivers, these engines weighed 355,000 pounds and developed a tractive effort of 45,300 pounds. They had 22x30-inch cylinders and carried 275 pounds of boiler pressure. Their steaming capacity stemmed from an 81-square-foot grate area, together with an evaporative heating surface of 3791 square feet augmented with 1542 square feet of superheater surface. This first class of CPR Hudsons was so successful that it was followed by 55 engines from the same builder having virtually identical dimensions, except for the "Royal Hudsons" which differed principally in their stream-styled appearance. No. 2806 appears here at CPR's Toronto terminal, in an image courtesy of Tom Rock of T.D.R. Productions. There is no information about the photographer, or the date when this view was snapped.