The Canadian National Railways had only five Hudson type locomotives, but their 80-inch diameter driving wheels made them the speediest steamers on the system. Erected in 1930 by Montreal Locomotive Works, class K-5-a featured 23x28-inch cylinders and a boiler pressure of 275 pounds per square inch. They had a locomotive weight of 356,400 pounds, and exerted a tractive force of 43,000 pounds (53,400 with booster in operation). Their 74 square feet of grate area, 3377 square feet of evaporative heating surface and 1465 square feet of superheater surface helped make them the speedsters they were in premium CNR passenger service before the arrival of diesels. An unidentified photographer snapped this photo as No. 5704, last engine in the series, took on coal at Stratford, Ontario. Tom Rock of T.D.R. Productions provided it for this collection.