Pere Marquette 2-8-4 No. 1222 posed for the builder's photo of the N-1 class that was delivered in 1941. These PM Berkshires had an evaporative heating surface totaling 4777 square feet, a superheater surface of 1932 square feet, and a grate area of 90 square feet. With the Pere Marquette's merger into the Chesapeake & Ohio in 1947 they were to be renumbered into the C&O 2600 series, but the renumbering was never applied to the N-1 and N-2 classes; this locomotive would have become C&O 2656. Retirement of the former PM 2-8-4s was complete by 1957, though some were not scrapped immediately but remained on the property until 1961. Two of them survived the torch; No. 1225 is operational at the Steam Railroading Institute in Owosso, Michigan.