Ferrocarril del Pacifico Alco RSD-12 No. 504 in Nogales, Sonora, Mexico, in March 1979.
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ALCO RSD-12 Diesel-Electric Locomotive
The ALCO RSD-12 was a diesel-electric locomotive of the road switcher type rated at 1,800 horsepower (1.34 MW), that rode on three-axle trucks, having an C-C wheel arrangement.

Used in much the same manner as its four-axle counterpart, the ALCO RS-11, though the six-motor design allowed better tractive effort at lower speeds.

Original buyers

Chesapeake and Ohio Railway
Quantity:  10
Road numbers:  6700–6709
Notes:  Renumbered 2007–2016, 2014 and 2016 were sold to Baltimore and Ohio Railroad, then were purchased by Utah Railway on February 23, 1976.

Lake Superior and Ishpeming Railroad
Quantity:  4
Road numbers:  1801–1804

New York, Chicago and St. Louis Railroad (“Nickel Plate Road”)
Quantity:  9
Road numbers:  325–333
Notes:  to Norfolk and Western Railway.

Pennsylvania Railroad
Quantity:  25
Road numbers:  8655–8679
Notes:  to Penn Central 6855–6879; to Conrail.

Southern Pacific Company
Quantity:  21
Road numbers:  7000–7020
Notes:  Renumbered 2950–2970.

Ferrocarril del Pacífico
Quantity:  19
Road numbers:  1502–1508, 509–520

Ferrocarriles Nacionales de México
Quantity:  73
Road numbers:  7400–7472

Companhia Siderúrgica Nacional (Brazil)
Quantity:  10
Road numbers:  3501–3510
Notes:  Built by MLW, 1,600 mm (5 ft 3 in); to RFFSA pt: ALCo RSD-12.

Total Quantity:  171

ALCO RSD-12 Overview
Type and origin
Power type: Diesel-electric
Builder: American Locomotive Company, Montreal Locomotive Works
Model: RSD-12
Build date: April 1956 – March 1963
Specifications
Configuration:
​ • AAR C-C
Gauge: 4 ft 8 1⁄2 in (1,435 mm) standard gauge
Prime mover: Alco 251B
Engine type: V12 Four-stroke diesel
Aspiration: Turbocharged
Cylinders: 12
Performance figures
Power output: 1,800 hp (1,300 kW)

See also:

Alco Diesel-Electric Locomotives

Diesel-Electric Locomotives

Locomotives

American Locomotive Company

Ferrocarril del Pacifico Alco RSD-12 No. 504 in Nogales, Sonora, Mexico, in March 1979.

By Clay Gilliland from Chandler, U.S.A. - ALCo RSD-12, CC BY-SA 2.0, https://commons.wikimedia.org/w/index.php?curid=31661459

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