Rock Island class P-33 Pacific No. 935 appears here at Kansas City, Kansas in March 1938. The image, which was saved from a discontinued Internet site, was in the Harold Vollrath collection and also appears in the ABPR Archive uploaded by Bud Laws. This class came from ALCo's Schenectady Works in 1910 with 74-inch drivers and 185 p.s.i. of boiler pressure, with cylinder dimensions that were soon modified to 23&fras12;x28 inches. They weighed 243,025 pounds and developed 32,859 pounds of tractive effort. Grate area measured 45 square feet, with 2951 square feet of evaporative heating surface and a superheating surface of 739 square feet. The whaleback tender was a feature of many of the Rock Island's older locomotives.