Like other North American locomotives that were among the first to feature a four-wheel trailing truck, the Chicago & North Western's Class H 4-8-4s were designed with an outside-cradle frame, in which the rear portion divides to the sides of the locomotive to allow for the deeper firebox and larger truck casting. A 1940 rebuilding gave these locomotives Boxpok disc drivers and roller bearings on all axles, and in the late 1940s 24 were rebuilt with new frames, cylinders, fireboxes, and other improvements and reclassified to H-1. The rebuilt locomotives had a boiler pressure of 275 p.s.i., and they developed 71,749 pounds of tractive effort. They had 4422 square feet of evaporative heating surface and 1840 square feet of superheating surface, both specifications being a reduction in the original steam-producing capacity. (For original dimensions see the commentary on No. 3035 following.) No. 3026, seen here at Chicago's Proviso terminal in May 1951, displays the final appearance of these powerful locomotives; it was scrapped in 1955. The image, acquired from an eBay seller, came from the Harold Vollrath collection.