The Alco S-3 were 660 horsepower (490 kW) switcher diesel-electric locomotives produced by ALCO and their Canadian subsidiary Montreal Locomotive Works (MLW).
The models differed only in that the earlier S-1 had ALCo#Blunt bogie trucks, while the later S-3 had AAR type A bogie trucks.
The S-3 was constructed between February 1950 and November 1953 (MLW until 1957) with total sales of 300.
Today there are a few members of the S-3 still exists.
Trivia[]
- ALCO and the Montreal Locomotive Works constructed approximately 300 S-3s for the North American market between 1950–1957.
- Nekoosa Paper Co. #13 is at the Illinois Railway Museum.
- Ex-Canadian Pacific MLW S-3 No. 6568 is on display at the Saskatchewan Railway Museum.
- Most likely the S3 sold fewer units than the S1 for a few reasons; first, railroads were probably looking for a more powerful switcher, which was already available in the S2; and second, aside from the S2, those that wanted the extra power had a second chance at doing so with the S4 (which replaced the S2).
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