Pacific No. 4518, a member of class K-11b, poses facing an unidentified companion at the North White Plains, New York, terminal in 1938. Erected by Alco in 1911-12, the K-11b class had 26x26-inch cylinders, carried 180 pounds of boiler pressure, and developed 38,970 pounds of tractive effort; otherwise their dimensions were similar to those of the K-11a class, described for No. 4422. A booster on some engines is reported to have added 11,000 pounds of tractive effort. Wayne Koch provided this image, photographer unknown, from his collection of vintage New York Central photos. The locomotive, originally numbered 3118, was retired in 1952.