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The ALCO S2 and S4 were 1,000 horsepower (746 kW) diesel electric switchers produced by ALCO and Canadian licensee Montreal Locomotive Works (MLW). The two locomotives differed only in trucks, with the S-2 using ALCO "Blunt" trucks, and the S-4 using AAR type A switcher trucks. Both were powered by ALCO 539 turbocharged, 6-cylinder diesels. The S-2 was built between August 1940 and June 1950, with a total of 1502 completed, while the S-4 was constructed between June 1949 and August 1957 (MLW until 1957) with total sales of 797. Canadian production of the S-4 started more than a year before U S production of the S-4. ALCO did not start building the S-4 until August 1950. A modified version, the S-7, was built by MLW only; 29 were built between June and August 1957. Design: The exterior of the locomotives were styled by an Alco engineer, Ray Patten, using curves in a mild application of Art Deco principles.

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