ALCO RS-2 Diesel-Electric Locomotive
The ALCO RS-2 is a 1,500–1,600 horsepower (1,100–1,200 kW) B-B road switcher diesel-electric locomotive built by the American Locomotive Company (ALCO) from 1946 to 1950. ALCO introduced the model after World War II as an improvement on the ALCO RS-1. The locomotive was one of several road switchers in a crowded market, including the Baldwin DRS-4-4-1500, EMD GP7, and FM H-15-44. ALCO discontinued the RS-2 in 1950 in favor of the ALCO RS-3. Several examples have been preserved.

Design and development
The RS2 was a further development of the road switcher concept. It had more horsepower than the RS1, and was better suited for heavy road service. Externally, the RS2 bodywork was more rounded, while mechanically the new 244 engine was introduced. A turbocharged four stroke V12 with a 9 in × 10 1⁄2 in (229 mm × 267 mm) bore and stroke developing 1,500 (later 1,600) hp at 1,000 rpm, it had a smaller cylinder, higher cylinder speed design than the 539 used in the RS1. Production of the RS-2 was delayed several months while Alco worked out the new four pipe divided low rise manifold for the GE constant pressure RD-1 turbocharger. The 244 engine was not a reliable design, however, and was replaced in less than ten years by the Alco 251 engine.

History
383 locomotives were produced — 374 by the American Locomotive Company, and 9 by Montreal Locomotive Works in Canada. Eight of the ALCO RS-2s were exported to Canada. The RS-2 has a single, 12 cylinder, model 244B engine, developing 1,500 horsepower (1,100 kW). Thirty-one locomotives built by Alco between February and May 1950 with the 12 cylinder 244C 1,600 horsepower (1,200 kW) engine.

ALCO built the RS-2 to compete with EMD, Fairbanks-Morse, and Baldwin Locomotive Works. In 1947, Fairbanks-Morse introduced the 1,500 hp (1.1 MW) H-15-44. Also in that year, Baldwin introduced the 1,500 hp (1.1 MW) DRS-4-4-1500. In the case of ALCO, Fairbanks-Morse, and Baldwin, each company increased the power of an existing locomotive line from 1,500 to 1,600 hp (1.1 to 1.2 MW), and added more improvements to create new locomotive lines.

EMD, however, kept its competing GP7 at 1,500 hp (1.1 MW) In 1954, EMD introduced the GP9. It was rated at 1,750 hp (1.30 MW).

EMD produced 2,734 GP-7s. ALCO produced 378 RS-2s, and 1,370 RS-3s. Fairbanks-Morse produced 30 H-15-44s, and 296 H-16-44s. Baldwin produced 32 DRS-4-4-1500s, and 127 AS-16s.

The Delaware and Hudson Railway rebuilt 13 of its RS-2s for passenger service, including on the Laurentian. The D&H added a steam generator and 1,600-US-gallon (6,100 l; 1,300 imp gal) water tank.

Original owners
ALCO and Montreal Locomotive Works in Canada built up to 383 locomotives. A nearly complete list follows below:

Quantity: Road numbers: 

Units Manufactured by ALCO

American Locomotive Company Demonstrator Units

Quantity: 4
Road numbers: 1500, 1500:2, 1501, 1600

Alton and Southern Railway

Quantity: 15
Road numbers: 28–42

Atlantic and Danville Railway

Quantity: 6
Road numbers: 101–106

Belt Railway of Chicago

Quantity: 9
Road numbers: 450–458

Birmingham Southern Railroad

Quantity: 1
Road number: 150

Boston and Maine Railroad

Quantity: 9
Road numbers: 1501–1504, 1530–1534

Canadian Pacific Railway

Quantity: 5
Road numbers: 8400–8404

Carolina & North-Western Railway

Quantity: 4
Road numbers: 1–4

Chesapeake and Ohio Railway

Quantity: 2
Road numbers: 5500–5501

Chicago and North Western Railway

Quantity: 1
Road number: 1503

Chicago Great Western Railway

Quantity: 8
Road numbers: 50–57

Chicago, Indianapolis and Louisville Railroad

Quantity: 7
Road numbers: 21–27

Chicago, Rock Island and Pacific Railroad

Quantity: 5
Road numbers: 450–454

Danville and Western Railway

Quantity: 2
Road numbers: 1–2

Delaware and Hudson Railway

Quantity: 26
Road numbers: 4000–4025

Detroit and Mackinac Railway

Quantity: 6
Road numbers: 466–469, 4610, 481

Elgin, Joliet and Eastern Railway

Quantity: 10
Road numbers: 800–809

Erie Railroad

Quantity: 19
Road numbers: 900–913, 1000–1004

Great Northern Railway

Quantity: 20
Road numbers: 200–219

Green Bay and Western Railroad

Quantity: 4
Road numbers: 301–304

Gulf, Mobile and Ohio Railroad

Quantity: 14
Road numbers: 1501–1514

Kennecott Copper Corporation

Quantity: 9
Road numbers: 100–102, 104–107, 902–903

Lake Superior and Ishpeming Railroad

Quantity: 3
Road numbers: 1501–1503

Lehigh and New England Railroad

Quantity: 13
Road numbers: 651–663

Lehigh Valley Railroad

Quantity: 5
Road numbers: 210–214

Macon, Dublin and Savannah Railroad

Quantity: 3
Road numbers: 1700–1702

Maine Central Railroad

Quantity: 5
Road numbers: 551–555

Missouri-Illinois Railroad

Quantity: 1
Road number: 61

New York, New Haven and Hartford Railroad

Quantity: 17
Road numbers: 0500–0516

New York Central Railroad

Quantity: 23
Road numbers: 8200–8222

Oliver Iron Mining Company

Quantity: 8
Road numbers: 1100–1107

Ontario Northland Railway

Quantity: 2
Road numbers: 1300–1301

Roberval and Saguenay Railway

Quantity: 1
Road number: 19

St. Louis and Belleville Electric Railway

Quantity: 1
Road number: 700

St. Louis-San Francisco Railway

Quantity: 5
Road numbers: 550–554

Seaboard Air Line Railroad

Quantity: 29
Road numbers: 1600–1628

Southern Railway

Quantity: 30
Road numbers: 2101–2130

Spokane, Portland and Seattle Railway

Quantity: 3
Road numbers: 60–62

Texas and Pacific

Quantity: 1
Road number: 1100

Texas Pacific-Missouri Pacific Terminal Railroad of New Orleans

Quantity: 2
Road numbers: 21–22

Toledo, Peoria and Western Railway

Quantity: 7
Road numbers: 200–206

Union Pacific Railroad

Quantity: 5
Road numbers: 1191–1195

Union Railroad

Quantity: 12
Road numbers: 601–612

Western Maryland Railway

Quantity: 5
Road numbers: 180-184

Youngstown and Northern Railroad

Quantity: 1
Road number: 231

Total Quantity: 368

Units Manufactured by Montreal Locomotive Works

Canadian Pacific Railway

Quantity: 4
8405–8408

Napierville Junction Railway

Quantity: 2
4050–4051

Ontario Northland Railway

Quantity: 2
1302–1303

Roberval and Saguenay Railway

Quantity: 1
20

Total Quantity: 9

Survivors
Very few RS-2s survive today. Three former Kennecott Copper locomotives are preserved, including Kennecott Copper 908 (former number 104) at the Western Pacific Railroad Museum at Portola, California. KCC 908 once served the mines out of Ely, Nevada along the Nevada Northern Railway. Nevada Northern 105 is at Ely, Nevada, it was formerly the Kennecott Copper 105. Kennecott Copper 103 is at the San Diego Railroad Museum in Campo, California. It is painted as Santa Fe 2098. Another RS-2 is in active service on the Texas State Railroad (rebuilt as an RS-2-CAT). It is the former Union Railroad 608. The first production RS-2, originally sold to the Detroit & Mackinac RR as their number 466, was fully operable in freight service on the Michigan Southern Railroad (1989) until a few years ago. As of September 2005, the 466 was stored out of service near the Michigan Southern's office in White Pigeon, Michigan, it was finally scrapped in December 2011. The former Detroit & Mackinac 469 was sold to Waymore Power and may be restored. The former Elgin Joliet and Eastern 801 is preserved in Jala, Mexico as a Las Encinas SA de CV 801, and MLW-built Roberval and Saguenay 20 is at the Canadian Railway Museum.

ALCO RS-2 Overview
Type and origin
Power type: Diesel-electric
Builders: American Locomotive Company, Montreal Locomotive Works
Model: RS-2
Build date: October 1946 – May 1950
Total produced: 383
Specifications
Configuration:
​ • AAR B-B
Gauge: 4 ft 8 1⁄2 in (1,435 mm) standard gauge
Trucks: AAR type B
Wheel diameter: 40 in (1,000 mm)
Minimum curve: 57° (104.79 ft or 31.94 m)
Wheelbase: 39 ft 4 in (11.99 m)
Length: 56 ft (17 m)
Width: 10 ft (3.0 m)
Height: 14 ft 5 in (4.39 m)
Locomotive weight: 249,600 lb (113,200 kg)
Fuel capacity: 800 US gal (3,000 L; 670 imp gal)
Prime mover: Alco 244-B, 244-C
Engine type: V12 Four-stroke diesel
Aspiration: Turbocharger
Generator: GE 5GT-564B-1
Traction motors: (4) GE 752-A
Cylinders: 12
Cylinder size: 9 in × 10 1⁄2 in (229 mm × 267 mm) bore x stroke
Performance figures
Power output: 1,500 hp (1.119 MW) @ 1,000rpm
Power output: later models 1,600 hp (1.193 MW)
Tractive effort: 62,500 lb (28,300 kg)
Career
Locale: North America

See also:

Alco Diesel-Electric Locomotives

Diesel-Electric Locomotives

American Locomotive Works

Locomotives

Santa Fe Railway Alco RS-2 No. 2098 at San Diego, California.

By Original uploader was Mr Snrub at en.wikipedia - Transferred from en.wikipedia, GFDL, https://commons.wikimedia.org/w/index.php?curid=5051586

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Texas State Railroad ALCO RS2 No. 7 at Rusk Terminal.
Santa Fe Railway Alco RS-2 No. 2098 at San Diego, California.

Texas State Railroad ALCO RS2 No. 7 at Rusk Terminal.

By Rvassar - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=11809497

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