RSD-15/RSD-17 Diesel Locomotive

Prototype Information

ALCO introduced the RSD-15 in 1956 as a powerful six-axle road-switcher designed for heavy freight service. Powered by a 2,000-horsepower 244 diesel engine and featuring a C-C wheel arrangement, the RSD-15 delivered high tractive effort, making it ideal for mountainous terrain and long, heavy trains. Railroads such as the New York Central, Canadian Pacific, and Northern Pacific adopted the RSD-15 for its reliability, versatility, and ability to handle demanding mainline service.

The RSD-17 followed in 1957 as an improved version of the RSD-15, incorporating a higher 2,300-horsepower rating, upgraded electrical systems, and refinements to boost performance and efficiency. While produced in smaller numbers, the RSD-17 offered railroads even more power and capability for challenging freight operations.

Together, the RSD-15 and RSD-17 represented ALCO’s peak in six-axle road-switcher design, providing a strong alternative to EMD’s high-horsepower locomotives of the late 1950s.