The Duluth, Missabe and Iron Range Railway (DM&IR) (reporting mark DMIR), informally known as the Missabe Road,[1] 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.

The following year, the Duluth and Iron Range Rail Road (D&IR) and Interstate Transfer Railway were added.

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.

As well as the Yellowstones, the DM&IR had heavy 2-8-8-2 articulated's (also Class M), 2-8-2 Mikados, 2-10-2 Santa Fe's and eventually 2-10-4 Texas types from B&LE.

After World War II, the DM&IR hauled increasing tonnage to the ore docks along Lake Superior, reaching a record of over 49 million tons in 1953.

Dieselization continued with the purchase of several EMD SD9 road switchers the following year, while the last revenue steam run occurred in 1962.

In 2001, the DM&IR and other holdings were spun off from Transtar into the company Great Lakes Transportation (GLT), which was fully owned by the Blackstone Group.