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ALCO RSD-4
Kennecott Copper Corporation locomotive 201 on display at Snoqualmie Depot, Snoqualmie, Washington
Type and origin Power type Diesel-electric Builder ALCO Model RSD-4 (Specification E1663) Build date 1951–1952 Total produced 36
Specifications Configuration: ​  • AAR C-C Gauge 4 ft 8+1⁄2 in (1,435 mm) standard gauge Trucks ALCO trimount Wheel diameter 40 in (1,000 mm) Minimum curve 21° (274.37 ft or 83.63 m) Wheelbase 42 ft 3 in (12.88 m) Length 56 ft 6 in (17.22 m) Width 10 ft 1+7⁄8 in (3.096 m) Height 14 ft 5+1⁄4 in (4.401 m) Loco weight 278,860 lb (126,490 kg) Fuel capacity 800 US gal (3,000 L) Prime mover ALCO 244 RPM range 1000 (max) Engine type V12 Four-stroke engine diesel Aspiration Turbocharger Displacement 8,016 cu in (131.36 L) Generator GE 5GT-581A1 Traction motors (6) GE 5GE752-C1 Cylinders 12 Cylinder size 9 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. 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 Due to the inadequate capacity of the main generator, this model was later superseded in production by the ALCO RSD-5.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

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. As of 2021, it has been returned to Ely, Nevada (along with EMD SD7 #401) to the Nevada Northern Railway Museum.

References

1. ^ Marre, Louis A. (1995). Diesel locomotives : the first 50 years : a guide to diesels built before 1972. Waukesha, WI: Kalmbach Pub. Co. p. 247. ISBN 0-89024-258-5. OCLC 34531120.
2. "Northwest Railway Museum moves two 330,000-pound locomotives". 3 November 2021.
3. "Bring 401 and 201 Home".

• 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.

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