Classic Streamliners - TRAINCYCLOPEDIA
ALCO Century C-643DH Diesel Hydraulic Locomotive
The ALCO C-643DH, 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 (No. 9018 – No. 9020). The Alco C-643DHs joined 21 Krauss-Maffei ML-4000 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 C-643DHs in 1973.
Southern Pacific Railroad
Road numbers: 9018–9020
ALCO C-643DH Overview
Type and origin
Power type: Diesel-hydraulic
Builder: American Locomotive Company (ALCO)
Order number: S-3374
Serial numbers: S-3374-01 – S-3374-03
Build date: September 1964
Total produced: 3
AAR wheel arrangement: C-C
UIC class: C′C′
Gauge: 4 ft 8 1⁄2 in (1,435 mm)
Length: 75 ft 10 in (23.11 m)
Locomotive weight: 378,000 lb (171,000 kg)
Prime mover: ALCO 251C, (x 2)
Engine type: V12 Four-stroke diesel, (x 2)
Displacement: 8,016 cu in (131.36 L)
Cylinders: 12 (x 2)
Cylinder size: 9 by 10 1⁄2 inches (229 mm × 267 mm)
Transmission: Voith hydraulic
Locomotive brake: Straight air
Train brakes: Air
Maximum speed: 77 mph (124 km/h)
Power output: 4,300 hp (3,200 kW)
Tractive effort: 95,000 lbf (422.58 kN)
Operator: Southern Pacific Railroad
Numbers: 9018–9020 (later 9150–9152; final 9800-9802)
Locale: North America
Disposition: Scrapped 1973
Southern Pacific No. 9152, formerly SP No. 9020.
By The original uploader was Can't Undo at English Wikipedia - Transferred from en.wikipedia to Commons., CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=2648679
Text: wikipedia.org. Images: Public Domain; http://www.commons.wikimedia.org (unless otherwise specified) and 17 U.S. Code § 107 fair use. References: Lewis, Robert G. The Handbook of American Railroads. New York: Simmons-Boardman Publishing Corporation, 1951, 2nd Edition 1956. Site Map Contact webmaster HERE.
Purchases through our Merchant Links and Store help to defray the costs of operating the non-profit Classic Streamliners website, and at no additional cost to you. All of the staff at Classic Streamliners are unpaid volunteers who have all devoted thousands of hours of their own time to bring the site into fruition. We would like to sincerely thank all those who have already helped support this worthy cause. For more information click HERE.