ALCO DH643
From Wikipedia, the free encyclopedia
 Southern Pacific Railroad #9020, redesignated #9152. |
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| Power type | Diesel-Hydraulic |
|---|---|
| Builder | American Locomotive Company (ALCO) |
| Model | DH643 |
| Build date | September 1964 |
| Total production | 3 |
| AAR wheel arr. | C-C |
| Gauge | 4 ft 8½ in (1435 mm) |
| Length | 75 ft 10 in (23.11 m) |
| Total weight | 378,000 lb (171,000 kg) |
| Prime mover | ALCO 251C (2) |
| Engine type | four stroke diesel |
| Aspiration | Turbocharger |
| Displacement | 16,032 in³ (262.7 L) |
| Cylinders | V12 (2) |
| Cylinder size | 9 in × 10.5 in (229 mm × 267 mm) |
| Transmission | Voith hydraulic |
| Top speed | 77 mph (124 km/h) |
| Power output | 4,300 hp (3,200 kW) |
| Tractive effort | 95,000 lbf (423 kN) |
| Locomotive brakes | Straight air |
| Train brakes | Air |
| Locale | North America |
The ALCO DH643, also known as the Century 643DH, was a twin-engine diesel-hydraulic locomotive, the first diesel-hydraulic unit built in the United States. It had a C-C wheel arrangement and generated 4,300 hp (3,200 kW). Only three were built, all for Southern Pacific Railroad in 1964 (#9018–#9020). The Alco DH643s joined 21 Krauss-Maffei diesel-hydraulics already on the Southern Pacific's roster. These hydraulic-drive diesels spent most of their service lives in the flat San Joaquin Valley in California.
Dissatisfaction over the poor performance of diesel-hydraulic locomotives, as well as their use of foreign-made components (the hydraulic transmission was of German Voith design), eventually led Southern Pacific to scrap the DH643s in 1973.
[edit] References
- ALCO 244 and 251 Diesel Engines. Pacific Southwest Railway Museum. Retrieved on February 20, 2006.
- Pinkepank, Jerry A. (1973). The Second Diesel Spotter's Guide. Kalmbach Publishing Co., Milwaukee, WI. ISBN 0-89024-026-4.
[edit] External links
| 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 |
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