Earlier K-3 subclasses were built with the riveted trailing truck, and many members of those classes were retrofitted with the one-piece steel casting that served as as a bed for a booster engine, raising their tractive effort from 30,900 to 40,610 pounds. Some members of the K-3q class, however, apparently came from Alco's Brooks works in 1923 equipped with the booster, with a locomotive weight of 298,800 pounds. They had 3424 square feet of evaporative heating surface, 832 square feet of superheating surface, and a grate area of 57 square feet. For other specifications of the K-3 class consult the commentaries for Nos. 4707 and 4728. An unknown photographer captured this image of K-3q class 4-6-2 No. 4683 at Harmon, New York, in 1936 shortly after her renumbering from 3283; she was withdrawn from service and scrapped in 1952. Wayne Koch provided the image from his collection.