A mainstay of the New York Central's fast passenger fleet as the twentieth century opened, the Atlantic or 4-4-2 type soon found itself unequal to the larger, heavier trains that could be hauled by the newly introduced Pacific or 4-6-2 type. By 1940 the number of Atlantics still on the system's roster had dwindled to a mere six, including the five engines of class I-40a. Here, No. 4322 pauses with a local at the depot in Three Rivers, Michigan. Originally numbered 4755, she was a 1907 product of the American Locomotive Company, part of a group delivered to the Lake Shore & Michigan Southern. I-40a weighed 167,500 pounds and rolled on 69-inch drivers. These engines had 19x26-inch cylinders and a boiler pressure of 180 p.s.i. With dimensions of this size, they exerted a mere 20,810 pounds of tractive effort. Given the Central's heavy investment in larger passenger power since the appearance of this I-40 class — an investment being renewed in 1937-38 with the marvelous J-3a 4-6-4s as well as the dual-service L-3a 4-8-2s a few years later — it is reasonable to suppose that No. 4322's days were numbered when an unknown photographer recorded her on film on May 28, 1937. However, records show that she lasted till September 1947, making her the last 4-4-2 to serve on the New York Central.