Model of 1800 hp Co′Co′ American diesel locomotives
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EMD SD18
Chicago and Illinois Midland Railway 60 coupled to two SD9 locomotives at Springfield, Illinois, 7 May 1966
54 examples of this locomotive model were built for American railroads,[1] and 60 for export, including fifteen for Korail (order numbers 700735–700749, serial numbers 28373–28387).
The SD18 was the third model in EMD's SD (special duty) line of locomotives. It was designed as a modified GP18 which had six axles instead of four. The additional axles allowed for more tractive effort and a more even distribution of weight compared to the GP18.[1]
At least four SD18s have been preserved. Chop-nosed Duluth, Missabe & Iron Range 193 is now an operating member of the Lake Superior Railroad Museum collection. They also previously had DM&IR 316 in their collection, which is an "SDM"; an EMD SD18 given EMD 645 power assemblies by the Missabe, though still labeled as an SD18.[2] In 2019 #316 was traded for Northern Pacific #245 and left the museum for the Dakota Quality Grain Corporation in Parshall, N.D.