The Missouri Pacific's seven class MT-75 4-8-2s were 1939-1940 rebuilds of the MT-69 group delivered by Alco in 1919. For service on its premium passenger trains the railroad's Sedalia, Missouri shops applied 75-inch disc drivers, lightweight rods and roller bearings. Their new boilers sustained 225 pounds per square inch of pressure, and the engines were converted to burn oil and supplied with new tenders. Their cylinder dimensions were 25½x30 inches, their locomotive weight was 370,100 pounds, and they produced a tractive effort of 53,720 pounds. The MP was apparently proud of its own shops' creations and featured this image of No. 5321, first of the rebuilt and renumbered class, in the 1951 edition of Rand McNally's World Railways.