This view of the left side of C&O 2-10-4 No. 3018 was taken at Russell, Kentucky in September 1948. The photo, by an unidentified lensman, comes from the famous collection of the late Harold K. Vollrath, but this image was acquired from a now-discontinued Flickr site. The Railfan.net ABPR Archive contains the same image, uploaded in 2003 by Bud Laws.
To crown the success of the C&O 2-10-4 design, the Pennsylvania Railroad, when faced with World War II locomotive design restrictions, based its 125 2-10-4s of 1942-44 on the same blueprint with only minor or cosmetic alterations. The Pennsylvania J1s, so unlike that idiosyncratic railroad's own experiments in late steam design, are often said to be its best modern steam power.