The Alco RS-3 locomotive is a 1,600 horsepower B-B road switcher. It was manufactured from May 1950 to August 1956 and 1,370 were produced, 1,265 for American railroads, 98 for Canadian railroads, and 7 for Mexican railroads. It has a single, 12 cylinder, model 244 engine. Alco produced the RS-3 to compete with EMD, Baldwin Loco Motive Works, & Fairbanks-Morse. The RS-3 locomotive was one of the popular RS locomotives.