The ALCO RSD-4 was a diesel-electric locomotive of the road switcher type rated at 1600 horsepower (1.2 MW) that rode on three-axle trucks having an C-C wheel arrangement.Used in much the same manner as its four-axle counterpart the ALCO RS-3 though the six-motor design allowed better tractive effort at lower speeds. Due to the inadequate capacity of the main generator this model was later superseded in production by the ALCO RSD-5
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