The EMD SD18 is a 6-axle diesel locomotive built by General Motors Electro-Motive Division between April 1960 and March 1963.

The additional axles allowed for more tractive effort and a more even distribution of weight compared to the GP18.

Chop-nosed Duluth, Missabe & Iron Range 193 is now an operating member of the Lake Superior Railroad Museum collection.

[2] In 2019 #316 was traded for Northern Pacific #245 and left the museum for the Dakota Quality Grain Corporation in Parshall, N.D. As of March 2022, grain terminal operator AgRail LLC of Bloomington, Illinois has acquired Western Rail Inc. SD18M No.

The unit began service with Minnesota's Reserve Mining in May 1961 and was last used by the Western Milling plant in Goshen, CA.