The ALCO RS-1 is a type of diesel-electric locomotive built by the American Locomotive Company (ALCO) from 1941 to 1960. It was designed for both freight and passenger service, featuring a 1,600 horsepower engine. The RS-1 is notable for its versatility and reliability, making it a popular choice among railroads in the United States. With a total production of over 1,200 units, the RS-1 became a significant part of many railroads' fleets. Its design includes a distinctive low hood and a long, streamlined body, which contributed to its efficiency and ease of operation. The locomotive is often associated with the transition from steam to diesel power in the rail industry.