The ALCO RSD-4 was a six axle diesel-electric locomotive built by the American Locomotive Company between 1951 and 1952. It was a derivative of the four-axle ALCO RS-3, with two additional powered axles which allowed better tractive effort at lower speeds. Due to the inadequate capacity of the main generator, this model was later superseded in production by the ALCO RSD-5.
Original owners RailroadQuantityRoad numbersNotesAtchison, Topeka and Santa Fe Railway 10 2100–2109 Chicago and North Western Railway 5 1515–1517, 1619–1620| |Central Railroad of New Jersey 14 1601–1614 Kennecott Copper Corporation 1 201 PreservedUtah Railway 6 300–305 Total 36
Preserved units The only ALCO RSD-4 that has survived is Kennecott Copper Corporation #201. It resided at the Northwest Railway Museum until November 2021 (formerly known as the Puget Sound & Snoqualmie Valley Railway) in Snoqualmie, Washington in its orange Kennecott paint scheme. As of 2021, it has been returned to Ely, Nevada to the Nevada Northern Railway Museum.
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