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Baldwin DS-4-4-750 Diesel-Electric Locomotive
The Baldwin DS-4-4-750 was a four-axle 750 horsepower (560 kW) diesel-electric switcher built by the Baldwin Locomotive Works at it Eddystone, Pennsylvania factory between 1949 and 1951. It was a bridge between the 660 horsepower (490 kW) DS-4-4-660 and the S-8. It was the low power companion in Baldwin's catalog to their DS-4-4-1000 and the S-12.

Page 40 of the Dolzall brothers book "Diesels from Eddystone" describes the DR-4-4-750 as a "Horsepower boost for a lagging seller." Baldwin dropped the DR-4-4-660 model and introduced the new 750 HP DR-4-4-750. The Atchison, Topeka & Santa Fe (AT&SF) purchased nine in August 1948 and 21 units were sold in 1949 to six different customers.

Original owners

Baldwin Locomotive Works (plant)
Quantity: 1
Road Number: 301
Notes: to Weyerhaeuser Timber Company 301 in 1956; became Texas South-Eastern 301, now R.J. Corman (Texas Line) 301.

Baldwin Locomotive Works (demonstrators)
Quantity: 2
Road Numbers: 750–751
Notes: to Weyerhaeuser Timber Company 101–102.

American Cyanamid Company
Quantity: 1
Road Number: 14

American Steel and Wire Company
Quantity: 1
Road Number: 20

Atchison, Topeka and Santa Fe Railway
Quantity: 9
Road Numbers: 525–533

California Western Railroad
Quantity: 2
Road Numbers: 51–52

Erie Railroad
Quantity: 4
Road Numbers: 386–389

Pennsylvania Railroad
Quantity: 24
Road Numbers: 5595–5618

Texas Mexican Railway
Quantity: 2
Road Numbers: 509–510

Warner Company
Quantity: 1
Road Number: 14

Youngstown Sheet and Tube
Quantity: 6
Road Numbers: 608–610, 700–702

Total Units: 53

Baldwin DS-4-4-750 Overview
Type and origin
Power type: Diesel-electric
Builder: Baldwin Locomotive Works
Model: DS-4-4-750
Build date: July 1949 to February 1951
Total produced: 53
Specifications
Configuration:
​ • AAR B-B
 • UIC B′B′
Gauge: 4 ft 8 1⁄2 in (1,435 mm)
Prime mover: 606NA
RPM range: 625 rpm max.
Engine type: Four-stroke diesel
Aspiration: Normally aspirated, solid injection
Displacement: 1,979 cu in (32.43 L) per cylinder
Displacement: 11,874 cu in (194.58 L) total
Generator: DC generator
Traction motors: DC traction motors
Cylinders: Straight-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: 750 hp (559 kW)
Career
Locale: North America

See also:

Baldwin Diesel Locomotives

Diesel-Electric Locomotives

Baldwin Locomotive Works

ATSF No. 631, a Baldwin DS-4-4-750, switching Train 1, the San Francisco Chief at Amarillo, Texas.  Photo by Roger Puta. 

BLW logo
ATSF No. 631, a Baldwin DS-4-4-750, switching Train 1, the San Francisco Chief at Amarillo, Texas. Photo by Roger Puta.

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