ALCO RSD-1
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 Former US Army ALCO RSD-1, now owned by the Tennessee Valley Railroad Museum. TVRM has two of these unique locomotives. |
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| Power type | Diesel-electric |
|---|---|
| Model | RSD-1 |
| Build date | March 1941 – March 1960 |
| Total production | 417 |
| AAR wheel arr. | C-C |
| Gauge | 4 ft 8½ in (1435 mm) |
| Length | 55 ft 5.75 in (16.2 m) |
| Width | 10 feet (3 m) |
| Height | 14 ft 5 in (4.4 m) |
| Total weight | 247,500 lb (110,000 kg) |
| Fuel capacity | 1,000 gal (6,056 L) |
| Prime mover | ALCO 539T |
| Engine type | 4-stroke diesel |
| Aspiration | Turbocharger |
| Displacement | 8,256 in³ (135.2 L) |
| Cylinders | Straight-6 |
| Cylinder size | 9 in × 10.5 in (229 mm × 267 mm) |
| Transmission | DC generator, DC traction motors |
| Top speed | 65 mph (105 km/h) |
| Power output | 1,000 hp (745 kW) |
| Locomotive brakes | straight air |
| Train brakes | air |
| Locale | North America, Soviet Union |
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 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.
Most of the RSD-1s were shipped overseas to the Soviet Union during World War II, as part of the Allied war effort. Operated on the Trans-Iranian Railway, these locomotives kept the trains running and helped to assure eventual victory over Nazi Germany in 1945. Subsequently, the Soviets kept many of the RSD-1s after the war, adopting the design to form the basis of their own line of diesel locomotives.
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| Diesel-electric locomotives built by ALCO | |
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| Switchers: | HH series, S-1, S-2, S-3, S-4, S-5, S-6, T-6, SB-8/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: | DL-103b, DL-105, DL-107, DL-109, DL-110, DL-203, FA, FB, PA, PB |
| Century series: | C415, C420, C424, C425, C430, C628, C630, C636, C855 |
| Diesel-hydraulics: | DH643 |
