description ALCO RSD-15 Overview
The ALCO RSD-15 is a six-axle diesel-electric locomotive built by the American Locomotive Company in the late 1950s for heavy freight service. Its long, low hood led railroad enthusiasts to nickname the type Alligators, distinguishing it visually from shorter-hood road-switcher designs. The locomotive belongs to the transition-era generation of North American diesel power and remains relevant to railway preservation, historical study, and model-railroad collections.
help ALCO RSD-15 FAQ
Why is the ALCO RSD-15 locomotive called an Alligator?
The nickname comes from the locomotive's long, low short hood, which gives its profile a reptile-like appearance. Most RSD-15s used that low-hood arrangement, making Alligator a natural railroad nickname.
How powerful is an ALCO RSD-15?
The RSD-15 uses an ALCO 251 16-cylinder V16 diesel engine rated at 2,400 horsepower. All six axles are powered through GE 752 traction motors for heavy road-switching work.
When was the ALCO RSD-15 built?
American Locomotive Company built the RSD-15 from August 1956 through June 1960. Only 75 locomotives were produced, which helps explain its appeal to locomotive collectors.
What does DL600B mean on an ALCO RSD-15?
DL600B is ALCO's model designation for the RSD-15. The locomotive is a six-axle C-C diesel-electric road switcher designed to pull freight rather than operate as a streamlined passenger engine.
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