The Alco RS-3 is a diesel-electric locomotive built by the American Locomotive Company (ALCO) from 1950 to 1966. It features a 1,600 horsepower engine and is known for its versatility in freight and passenger service. The RS-3 is part of the RS series, which stands for "Road Switcher," designed for both yard and mainline operations. With a total production of over 1,300 units, the RS-3 became popular among various railroads in the United States and Canada. Its distinctive design includes a short hood and a long cab, making it easily recognizable. The locomotive's reliability and power contributed to its long-lasting presence in the rail industry.