ALCO RSD-12

ALCO RSD-12
Ferrocarril del Pacifico 504 in Nogales, Sonora, Mexico, in March 1979
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)

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

Railroad	Quantity	Road numbers	Notes
Chesapeake and Ohio Railway	10	6700–6709	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	4	1801–1804
New York, Chicago and St. Louis Railroad (“Nickel Plate Road”)	9	325–333	to Norfolk and Western Railway
Pennsylvania Railroad	25	8655–8679	to Penn Central 6855–6879; then to Conrail 1101-1123 and rebuilt into Alco mt6. 14 went to Norfolk Southern and 9 to CSX 1006-1016 with two retired upon Conrail purchase.
Southern Pacific Company	21	7000–7020	Renumbered 2950–2970, rebuilt from RSD-5 locomotives with a new motor and carbody, retaining generators and bogeys
Ferrocarril del Pacífico	19	1502–1508, 509–520
Ferrocarriles Nacionales de México	73	7400–7472
Companhia Siderúrgica Nacional (Brazil)	10	3501–3510	Built by MLW, 1,600 mm (5 ft 3 in); to RFFSA pt:ALCo RSD-12
Total	171

See also

• List of ALCO diesel locomotives
• List of MLW diesel locomotives

References

• Komanesky, John et al. The Diesel Shop. Retrieved July 3, 2008
• Pinkepank, Jerry A. (1973). The Second Diesel Spotter's Guide. Milwaukee, Wisconsin: Kalmbach Publishing. pp. 257–258. ISBN 978-0-89024-026-7.