The ALCO RSD-1 was a diesel-electric locomotive built by American Locomotive Company (ALCO). This model was a road switcher type rated at 1000 horsepower (750 kW) and rode on three-axle trucks having a C-C wheel arrangement. It was often used in much the same manner as its four-axle counterpart the ALCO RS-1 though the six-motor design allowed better tractive effort at lower speeds as well as a lower weight-per-axle.
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