Posing on the turntable at an unknown location is Chesapeake & Ohio 2-6-6-2 Mallet compound No. 1404. Outshopped by American Locomotive Company in 1918, the locomotives of class H-4 rolled on 56¼-inch drivers, weighed 449,000 pounds, and developed a tractive effort of 77,900 pounds. They had a boiler pressure of 210 pounds per square inch, and their cylinders had a 32-inch stroke; the high-pressure (rear) cylinders had a diameter of 22 inches, while that of the low-pressure (front) cylinders was 35 inches to accommodate the expanded, re-used steam. Their grate area totaled 73 square feet, their evaporative heating surface 4900 square feet, and their superheater surface 975 square feet. The C&O was a heavy user of these 2-6-6-2 compounds on its coal-mine branch lines, buying new locomotives of the same basic design as late as 1949; the ten members of the H-6 class delivered that year by Baldwin Locomotive Works were the builder's last steam order for service in North America. Tom Rock of T.D.R. Productions contributed this image to our Archive.