ALCO RSD-4

4 ft 8+1⁄2 in (1,435 mm) standard gaugeTrucksALCO trimountWheel diameter40 in (1,000 mm)Minimum curve21° (274.37 ft or 83.63 m)Wheelbase42 ft 3 in (12.88 m)Length56 ft 6 in (17.22 m)Width10 ft 1+7⁄8 in (3.096 m)Height14 ft 5+1⁄4 in (4.401 m)Loco weight278,860 lb (126,490 kg)Fuel capacity800 US gal (3,000 L)Prime moverALCO 244RPM range1000 (max)Engine typeV12 Four-stroke engine dieselAspirationTurbochargerDisplacement8,016 cu in (131.36 L)GeneratorGE 5GT-581A1Traction motors(6) GE 5GE752-C1Cylinders12Cylinder size9 in × 10.5 in (229 mm × 267 mm)

Performance figures
Power output	1,600 hp (1.2 MW)
Tractive effort	69,700 lb (31,600 kg)

The ALCO RSD-4 was a 1,600 horsepower (1.2 MW) six axle diesel-electric locomotive built by the American Locomotive Company between 1951 and 1952.^[1] It was a derivative of the four-axle ALCO RS-3, with two additional powered axles which allowed better tractive effort at lower speeds. Due to the inadequate capacity of the main generator, this model was later superseded in production by the ALCO RSD-5.

Original owners

Railroad	Quantity	Road numbers	Notes
Atchison, Topeka and Santa Fe Railway	10	2100–2109	[1]
Chicago and North Western Railway	5	1515–1517, 1619–1620	[1]
Central Railroad of New Jersey	14	1601–1614	[1]
Kennecott Copper Corporation	1	201	Preserved[1]
Utah Railway	6	300–305	[1]
Total	36

Preserved units

The only ALCO RSD-4 that has survived is Kennecott Copper Corporation #201. It resided at the Northwest Railway Museum until November 2021 (formerly known as the Puget Sound & Snoqualmie Valley Railway) in Snoqualmie, Washington in its orange Kennecott paint scheme.^[2] As of 2021, it has been returned to Ely, Nevada (along with EMD SD7 #401) to the Nevada Northern Railway Museum.^[3]

References

• Dorin, Patrick C. (1972). Chicago and North Western Power. Burbank, California: Superior Publishing. p. 141. ISBN 0-87564-715-4.
• Pinkepank, Jerry A. (1973). The Second Diesel Spotter's Guide. Milwaukee, Wisconsin: Kalmbach Publishing. p. 247. ISBN 978-0-89024-026-7.