In 1928, Baldwin Locomotive Works delivered four powerful class S-6 0-10-0s to the Duluth, Missabe & Northern. They were designed to switch heavy ore trains arriving at the Duluth ore docks; they weighed 352,250 pounds and exerted 85,931 pounds of tractive effort. Driver diameter was 57 inches, cylinder dimensions were 28x30 inches, and boiler pressure was 245 p.s.i. With an 80-square-foot grate area, they had 4175 square inches of evaporative heating surface and 1170 square inches of superheating surface. They were originally equipped with tender boosters, which were removed by 1930 when the DM&N combined operations with the Duluth & Iron Range (forming the Duluth, Missabe & Iron Range in 1937). These hefty 0-10-0s continued serving in their original task, and in ore transfer runs, until the mid-1950s, the last one being retired in 1958. No. 90, first of the class, appears here in an unattributed and undated photo acquired through eBay.