Illinois Central Railroad number 51000 was built in the McComb, Mississippi http://www.rrpicturearchives.net/rspicture.aspx?id=64684 shops with an aluminum superstructure to reduce weight with steel where required for strength and provided the standard dimensions, cushioned draft gear, easy-riding trucks, minimum 4 inches of insulation, adjustable ice bunker bulkheads and half-stage icing racks with forced air circulation through side wall flues and floor racks recommended by UFF&VA.