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The carbody configuration of the RS-1 pioneered the road switcher type of diesel locomotive. Most locomotives built since have followed this basic design. In 1940, the Rock Island Railroad approached ALCO about building a locomotive for both road and switching service.[1]
The first thirteen production locomotives were requisitioned by the US Army, the five railroads affected had to wait while replacements were manufactured. The requisitioned RS-1s were remanufactured by ALCO into six axle RSD-1s for use on the Trans Iranian Railroad to supply the Soviet Union during World War Two.
Chicago, Rock Island & Pacific 745 (believed to be the oldest existing RS-1, and one of the replacements for the 13 taken by the U.S. Army) at the Louisiana Steam Train Association yard in Jefferson, LA
Eastman Kodak Company 9 (built as Chicago & Western Indiana 260, sold to Genesee & Wyoming in 1971 and then to EKC) is preserved at the Rochester & Genesee Valley Railroad Museum.
Green Mountain Railroad 405 (former Rutland Railway 405, serial number 79575)
Catskill Mountain Railroad #400 (out of service & under repair) and #401 (operating) tourist train in Kingston NY.