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Alco's RS-3 originated in May 1950 as a replacment for the RS-2. Late RS-2s and all RS-3s had 1600 horsepower, all other RS-2s had 1500 HP. Known to ALCO as the E-1662, the engine was powered with a 12 cylinder 244 engine. In August 1956, the RS-3 was discontinued, only after 1370 RS-3s were built in the US, Canada, and Mexico. info from Diesel Locomotives, the First 50 Years
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