The Duluth, Missabe and Iron Range Railway (DM&IR) , informally known as the Missabe Road, was a railroad operating in northern Minnesota and Wisconsin that used to haul iron ore and later taconite to the Great Lakes ports of Duluth and Two Harbors, Minnesota. Control of the railway was acquired on May 10, 2004, by the Canadian National Railway (CN) when it purchased the assets of Great Lakes Transportation. History The DM&IR was formed by the merger in 1937 of the Duluth, Missabe and Northern Railway (DM&N) and the Spirit Lake Transfer Railway. The following year, the Duluth and Iron Range Rail Road (D&IR) and Interstate Transfer Railway were added. All of these had been leased by the DM&N since 1930. The D&IR was formed in 1874 by Charlemagne Tower to haul iron ore from the Minnesota Iron Co. in Tower, Minnesota, to the new Lake Superior port of Two Harbors, Minnesota. On July 31, 1884, the D&IR carried its first ore shipment from the Soudan Mine. In 1887, the D&IR was acquired by Illinois Steel Company, which itself became part of the new United States Steel Corporation (USS) in 1901. After high-grade Mesabi iron ore was discovered near Mountain Iron, Minnesota by the Seven Iron Men, the D&IR was asked to build a branch line to serve this area, but declined. So in 1891, the Merritts incorporated the DM&N, which shipped its first load of iron ore to Superior, Wisconsin, in October 1892. The following year, the Merritts expanded the DM&N by laying track to Duluth, Minnesota, where they built an ore dock. But this expansion left the Merritts on shaky financial ground, and in 1894, John D. Rockefeller gained control of the railway. In 1901, Rockefeller sold the DM&N to USS. From 1901 to 1938, the two railways were owned by USS and operated separately. Total ore hauled by the two railroads peaked in 1929 at and dropped to in 1932. Merger By July 1938, the two railways merged to form the DM&IR. The two operating divisions, the Missabe and the Iron Range, were based upon the predecessor roads. As the United States began to Second World War, the iron ore tonnage moving over the Missabe Road accelerated from a little over in 1938, past in 1939, then to almost in 1940 and past in 1941. The first eight of DM&IR's class M 2-8-8-4 Yellowstone locomotives were delivered