Southern Pacific #9152, formerly #9020.
Type and origin
American Locomotive Company (ALCO)
S-3374-01 – S-3374-03
AAR wheel arr. C-C
UIC classification C′C′
4 ft ( 8 in 1⁄ 2 1,435 mm)
75 ft 10 in (23.11 m)
378,000 lb (171,000 kg)
ALCO 251C, (2)
8,016 cu in (131.36 l)
Cylinder size 9 by
10 inches (230 mm × 270 mm) 1⁄ 2
77 mph (124 km/h)
hp (3,200 kW)
Tractive effort 95,000
lbf (422.58 kN)
Southern Pacific Railroad
9018–9020 (later 9150–9152; final 9800-9802)
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 (#9018–#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.
Original owners [ edit ]
See also [ edit ]
References [ edit ]
"ALCO 244 and 251 Diesel Engines". Pacific Southwest Railway Museum. Archived from the original on 13 January 2006 . Retrieved . 20 February 2006
Kirkland, John F. (1989). The Diesel Builders, Volume Two: American Locomotive Company and Montreal Locomotive Works. Interurban Press, Glendale, CA. ISBN 0-916374-81-5.
Pinkepank, Jerry A. (1973). The Second Diesel Spotter's Guide. Kalmbach Publishing Co., Milwaukee, WI. ISBN 0-89024-026-4.
Strapac, Joseph A. (1993). Southern Pacific Historic Diesels, Volume 2: Diesel-Hydraulic Locomotives. Shade Tree Books, Bellflower, CA. ISBN 0-930742-15-X.
Strapac, Joseph A. (2001). Southern Pacific Historic Diesels, Volume 8: Alco Roadswitcher Locomotives. Shade Tree Books, Bellflower, CA. ISBN 0-930742-23-0.
External links [ edit ]