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ALCO's RSD-4 was a diesel-electric locomotive of the road switcher type rated at 1600 horsepower, 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 Due to the inadequate capacity of the main generator, this model was later superseded in production by the ALCO RSD-5
| Diesel-electric locomotives built by ALCO |
| Switchers: |
HH series, S-1, S-2, S-3, S-4, S-5, S-6, T-6, SSB-9 |
| RS series: |
RS-1, RS-2, RS-3, RS-11, RS-27, RS-32, RS-36 |
| RSC series: |
RSC-2, RSC-3 |
| RSD series: |
RSD-1, RSD-4, RSD-5, RSD-7, RSD-12, RSD-15 |
| Cab units: |
Black Maria, DL-103b, DL-105, DL-107, DL-109, DL-110, FA, FB, PA, PB |
| Century series: |
C415, C420, C424, C425, C430, C628, C630, C636, C855 |
| Diesel-hydraulics: |
DH643 |
