Pacific No. 4422, in its original number 3022, poses for an anonymous photographer in Chicago sometime in the 1930s. By 1936 she was one of only 12 class K11a engines, of the original 50, that remained to be included in NYC's system-wide renumbering. Erected in 1910-11 by American Locomotive Company as class K10a, these locomotives received their new classification when retrofitted with superheaters in 1912. Their specifications, as rebuilt, included 200 pounds of boiler pressure per square inch, 25x26-inch cylinders, and 69-inch drivers. They weighed 272,000 pounds and produced a tractive effort of 40,040 pounds; those equipped with boosters mustered another 11,000 pounds. No. 4422 was retired in 1947, although a few members of the class lasted into the 1950s. The photo comes form the collection of Wayne Koch.