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
AAR wheel arr.	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)

Kennecott Copper Corporation locomotive 201 on display at Snoqualmie Depot, Snoqualmie, Washington.

The ALCO RSD-4 was a diesel-electric locomotive of the road switcher type rated at 1,600 horsepower (1.2 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-3, though the six-motor design 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 Due to the inadequate capacity of the main generator, this model was later superseded in production by the ALCO RSD-5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
Chicago and North Western Railway	5	1515–1517, 1619–1620
Central Railroad of New Jersey	14	1601–1614
Kennecott Copper Corporation	1	201	Preserved
Utah Railway	6	300–305
Total	36

Preserved units

The only ALCO RSD-4 that has survived is Kennecott Copper Corporation #201. As of 2007, it resides in fully restored condition at the Northwest Railway Museum (formerly known as the Puget Sound & Snoqualmie Valley Railway) in Snoqualmie, Washington, wearing a coat of bright orange paint.

References

Dorin, Patrick C. (1972). Chicago and NorthWestern Power. Superior Publishing. p. 141. ISBN 0-87564-715-4.
Pinkepank, Jerry A. (1973). The Second Diesel Spotter’s Guide. Milwaukee, WI: Kalmbach Publishing Company. p. 247. ISBN 0-89024-026-4.

Diesel-electric locomotives built by ALCO

Switchers	ALCO 300 ALCO 600 HH600 HH660 HH900 HH1000 S-1 S-2 S-3 S-4 DL420 S-5 S-6 T-6 SB-8/SSB-9

RS, RSC and RSD series	RS-1 RS-2 RS-3 RS-11 RS-27 RS-32 RS-36 RSC-1 RSC-2 RSC-3 RSD-1 MRS-1 RSD-4 RSD-5 RSD-7 RSD-12 RSD-15

Cab units	Rebel power car DL-103b DL-105 DL-107 DL-108 DL-109 DL-110 DL-202 DL-203 FA FB PA PB

Century series	C415 C420 C424 C425 C430 C628 C630 C636 C855

Diesel-hydraulics	DH643

Export locomotives	DL560C RSD-39

Unproduced locomotives	C428 C620 C624 C636F C636P C650DH

List of ALCO diesel Locomotives

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