description ALCO RS-11 Overview
The ALCO RS-11 is a four-axle diesel-electric road-switcher locomotive rated at 1,800 horsepower and built by the American Locomotive Company beginning in 1956. It uses ALCO's 251B prime mover and was designed for freight work, switching, and local duties associated with a road-switcher. The model belongs to the first generation of postwar North American diesel locomotives and is of interest to railroad historians, preservation operators, and model-railroad builders.
help ALCO RS-11 FAQ
What engine powers the ALCO RS-11?
The RS-11 uses ALCO's V-12 251B diesel engine rated at 1,800 horsepower. ALCO classified the locomotive as model DL-701 and introduced it in 1956 as a replacement for the RS-3. [ALCO RS-11 reference](https://www.trains-and-railroads.com/alco-rs-11)
When was the ALCO RS-11 built?
ALCO produced RS-11 locomotives from February 1956 through June 1961, with related production also occurring through Montreal Locomotive Works. The class was intended for freight, local road work, and switching rather than passenger service. [ALCO RS-11](https://en.wikipedia.org/wiki/ALCO_RS-11)
Was the RS-11 an alternative to the EMD GP9?
Yes, the 1,800 horsepower RS-11 was ALCO's answer to EMD's successful GP9 road-switcher. It offered more power than the earlier ALCO RS-3 but struggled to match EMD's reputation for reliability and market reach. [ALCO RS-11 reference](https://www.trains-and-railroads.com/alco-rs-11)
How many ALCO RS-11 locomotives were built?
About 426 RS-11 units were built for the United States and Mexico. Their four-axle road-switcher layout allowed them to work both mainline freight and local yard assignments. [ALCO RS-11 production data](https://www.trains-and-railroads.com/alco-rs-11)
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