page_title: ALCO S-1 and S-3
section_title: Preservation
hierarchical_section_title: ALCO S-1 and S-3 / Preservation
caption_attribution_description: English: Saskatchewan Railway Museum Canadian Pacific Railway S3 diesel electric locomotive #6568 constructed in 1957 by Montreal Locomotive Works. According to the SRM, it has a 660 horsepower McIntosh and Seymore 539 diesel engine which operates a General Electric generator. The electricity produced is 600 volts direct current which turns four traction motors driving each axle. This locomotive was used in Sutherland CPR train yards. This particular railway locomotive is a light switcher and was used to switch cars between tracks in the Sutherland train yards.
context_page_description: The ALCO S-1 and S-3 were 660 horsepower switcher diesel-electric locomotives produced by ALCO and their Canadian subsidiary Montreal Locomotive Works. These two locomotive 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-1 was built between April 1940 and June 1950, with a total of 543 completed, while the S-3 was constructed between February 1950 and November 1953 with total sales of 300. A modified version, the S-10, was built by MLW only; 13 were built between January and June 1958.
context_section_description: Numerous S-1 and S-3 locomotives remain in use, and several are preserved:
  Ex-U.S. Army S-1 No. 7372 is at the Western Pacific Railroad Museum and painted in Western Pacific colors.
  Ex-Canadian Pacific MLW S-3 No. 6568 is at the Saskatchewan Railway Museum.
caption: Ex-Canadian Pacific MLW S-3 No. 6568 on display at the Saskatchewan Railway Museum
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