The ALCO RS-2 is a 1,500 horsepower (1,100 kW), B-B road switcher railroad locomotive. It was manufactured by American Locomotive Company (ALCO) from October 1946 to May 1950, and 383 were produced — 366 by the American Locomotive Company, and 17 by Montreal Locomotive Works in Canada. It has a single, 12 cylinder, model 244 engine, devoloping 1,500 horsepower (1,100 kW). Thirty-one locomotives built by Alco between February and May 1950 had 1,600 horsepower (1,200 kW) engines.
ALCO built the RS-2 to compete with EMD, Fairbanks-Morse, and Baldwin Locomotive Works. In 1947, Fairbanks-Morse introduced the 1,500 hp (1.2 MW) H-15-44. Also in that year, Baldwin introduced the 1,500 hp (1.125 MW) DRS-4-4-1500. In the case of ALCO, Fairbanks-Morse, and Baldwin, each company increased the power of an existing locomotive line from 1,500 to 1,600 hp (1.125 to 1.2 MW), and added more improvements to create new locomotive lines.
EMD, however, kept its competing GP7 at 1,500 hp (1.125 MW) In 1954, EMD introduced the GP9. It was rated at 1,750 hp (1.3 MW).
EMD produced 2,729 GP-7s. ALCO produced 383 RS-2s, and 1,370 RS-3s. Fairbanks-Morse produced 30 H-15-44s, and 296 H-16-44s. Baldwin produced 32 DRS-4-4-1500s, and 127 AS-16s.
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