Frisco 4-6-2 No. 1039 poses for an unknown lensman in St. Louis on August 10, 1939 in this image from the collection of Donna Harrison-Rodeghiero. These Pacifics of class 1015 rolled off the Baldwin erecting floor in 1910, but the Frisco's Springfield shops extensively modified many of them in the late 1920s and early 1930s. Apparently No. 1039 was not among those rebuilt, and retained its 1910 dimensions of 69-inch drivers, 160 p.s.i. of boiler pressure, and 26x28-inch cylinders. They were among the first locomotives in North America to come from the builder with superheaters; they had 2851 square feet of evaporative heating surface, 679 square feet of superheater surface, and 51 square feet of grate area. Their locomotive weight was 212,000 pounds and they developed 37,307 pounds of tractive effort. Three of the class (not including this example) were streamlined in 1939 and given 73-inch drivers; photos of the streamlined engines are provided online by the Springfield Public Library.