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 Southern Pacific #9152, formerly #9020. |
|
| Power type | Diesel-hydraulic |
|---|---|
| Builder | American Locomotive Company (ALCO) |
| Order number | S-3374 |
| Serial number | S-3374-01 – S-3374-03 |
| Model | DH643 |
| Build date | September 1964 |
| Total production | 3 |
| AAR wheel arr. | C-C |
| UIC classification | C'C' |
| Gauge | 4 ft 8½ in (1435 mm) |
| Length | 75 ft 10 in (23.11 m) |
| Locomotive weight | 378,000 lb (171 t) |
| Prime mover | ALCO 251C, (2) |
| Engine type | Four stroke diesel |
| Aspiration | Turbocharger |
| Displacement | 8,016 cu in (131.36 l) |
| Cylinders | V12, (2) |
| Cylinder size | 9 in × 10½ 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 (420,000 N) |
| Locomotive brakes | Straight air |
| Train brakes | Air |
| Career | Southern Pacific Railroad |
| Number | 9018–9020 (later 9150–9152) |
| Locale | North America |
The ALCO DH643, also known as the Century 643DH, was a twin-engine diesel-hydraulic locomotive, the first diesel-hydraulic road unit built in the United States. It had a C-C wheel arrangement and generated 4,300 horsepower (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.
Original Owners
| Railroad | Quantity | Road numbers | Notes |
|---|---|---|---|
| Southern Pacific Railroad |
|
9018–9020 | renumbered 9150–9152 |
References
- "ALCO 244 and 251 Diesel Engines". Pacific Southwest Railway Museum. Retrieved on 20 February, 2006.
- Pinkepank, Jerry A. (1973). The Second Diesel Spotter's Guide, Kalmbach Publishing Co., Milwaukee, WI. ISBN 0-89024-026-4.
External links
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