The lowly 0-6-0 switcher, of which the Canadian National listed 317 in a 1937 roster, is represented here by No. 7439 posing for an unknown photographer at Chatham, Ontario. No. 7439 belonged to class O-18-a, and was built by the Grand Trunk Railway in 1919 as No. 1764. These switchers weighed 174,000 pounds and mustered a tractive effort of 36,700 pounds. The rolled on low drivers 51 inches in diameter, their cylinder dimensions were 22x26 inches, and their boiler pressure was 175 p.s.i. Tom Rock of Rock on Trains supplied this image, date unknown, for our Random Steam Collection. Two members of this class remain, including one that has been operational; No. 7470 has served tourist operations on the Conway Scenic Railroad in New Hampshire. No. 7439 was sold in 1958 to the International Harvester Co. of Canada.