One of two members of class NU-1b, delivered by Alco in 1916, P&LE compound 0-8-8-0 No. 9090 poses in or near Pittsburgh at an unknown date in the late 1930s. Articulated locomotives were rare on the "water Level Route" New York Central System, and these lumbering Mallets were probably restricted to heavy switching duties on its coal-and-ore-hauling subsidiary. With a low driver diameter of 52 inches and a boiler pressure of 200 p.s.i., they had high pressure (rear) cylinder dimensions of 26x28 inches, and low pressure (front) dimensions of 40x28 inches. They weighed 468,000 pounds and exerted 87,020 pounds of tractive effort. Specifications for the grate area of the NU-1 class are given as 80 square feet, with 5290 square feet of evaporative heating surface and 1235 square feet of superheater surface. No. 9090 was retired and scrapped in 1951. Wayne Koch contributed the image, from an unknown photographer.