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An 800 horsepower Baldwin S-8 Switcher.

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An 800 horsepower Baldwin S-8 Switcher.
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Rock Island Baldwin S-8 No. 803, September 1963.  Photo by Roger Puta

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Baldwin S-8 Diesel-Electric Yard Switcher Locomotive
The Baldwin S-8 was an 800-horsepower (600 kW) diesel-electric locomotive intended for use in yard switching. The Baldwin Locomotive Works produced a total of 63 units (61 for United States railroads and 2 for use in Cuba) between 1951 and 1953. Of these, nine were "calf" units built for Oliver Iron Mining Company in Minnesota. A tenth calf had been built for them on a verbal order, but when delivery was refused, it was fitted with a cab, and converted to a regular S-8.

Original owners

American Rolling Mill Company
Quantity: 3
Road numbers: 1151, 1152, 1201

Escanaba and Lake Superior Railroad
Quantity: 1
Road numbers: 102

La Salle and Bureau County Railroad
Quantity: 1
Road numbers: 8

Medford Corporation, (Medford, Oregon)
Quantity: 1
Road numbers: 8
Notes: Only Baldwin switcher built with dynamic brakes; preserved by the Southern Oregon Chapter, NHRS.

New Orleans Public Belt Railroad
Quantity: 2
Road numbers: 50, 51

Oliver Iron Mining Company
Quantity "Cow" units: 9
Road numbers "Cow" units: 1200A–1206A, 1214A, 1215A
Quantity "Calf" units: 9
Road numbers "Calf" units: 1200B–1206B, 1214B, 1215B

Pennsylvania Railroad
Quantity: 6
Road numbers: 8994–8999

Pennsylvania-Reading Seashore Lines
Quantity: 1
Road numbers: 6006

Chicago, Rock Island and Pacific Railroad
Quantity: 5
Road numbers: 802–806

Sharon Steel Corporation
Quantity: 8
Road numbers: 3–10

Sloss-Sheffield Steel
Quantity: 4
Road numbers: 33–36

United Railways of Havana, Cuba
Quantity: 2
Road numbers: 8001, 8002

US Pipe and Foundry
Quantity: 1
Road numbers: 37
Notes: Built as "calf"; fitted with cab before sale to USP&F; preserved by Heart of Dixie Railroad Museum (Calera, Alabama) as Jefferson Warrior 37.

US Steel
Quantity: 1
Road numbers: 13

Weyerhaeuser Company
Quantity: 2
Road numbers: 103, 105

Youngstown Sheet and Tube
Quantity: 7
Road numbers: 703, 800–805

Total A units: 54
Total B units: 9

Only two intact examples of the S-8 are known to survive today, one of which is owned by a railroad museum, while the other is the property of a railway historical society.

Baldwin S-8 Overview
Type and origin
Power type: Diesel-electric
Builder: Baldwin Locomotive Works
Model: S-8
Build date: March 1951 – September 1954
Total produced: 54, plus 9 "calf" units
AAR wheel arrangement: B-B
UIC class: B′B′
Gauge: 4 ft 8 1⁄2 in (1,435 mm) standard gauge
Prime mover: 606
RPM range: 625 rpm maximum
Engine type: Straight-6 Four-stroke diesel
Aspiration: Naturally aspirated, solid injection
Displacement per cylinder: 1,979 cu in (32.43 L)
Displacement total: 11,874 cu in (194.58 L)
Generator: DC generator
Traction motors: DC traction motors
Cylinders: 6
Cylinder size: 12 3⁄4 in × 15 1⁄2 in (324 mm × 394 mm)
Transmission: Electric
Locomotive brake: Air
Train brakes: Air
Performance figures
Power output: 800 hp (600 kW)
Locale: United States and Cuba
Disposition: Two preserved, remainder scrapped

See also:

Baldwin Diesel-Electric Locomotives


Diesel-Electric Locomotives