Chicago & North Western class E-4 4-6-4 No. 4006 appears at Cedar Rapids, Iowa on March 19, 1940 in a photo by D. W. Eldridge that came to our Random Steam Collection by way of an eBay purchase. With 84-inch drivers, a boiler pressure of 300 p.s.i. and cylinder dimensions of 25x29 inches, these 412,000-pound streamlined Hudsons exerted 55,022 pounds of tractive effort. Their grate area totaled 91 square feet, and they boasted 3958 square feet of evaporative heating surface together with 1884 square feet of superheater surface. In 1947-48 they were converted to burn oil, and spent their final days in Chicago suburban service. No. 4006 went to the scrapyard in 1961, apparently the final member of the group to meet its demise.