Baldwin DS-4-4-750

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.

Baldwin DS-4-4-750
#631, a DS-4-4-750 of the Atchison, Topeka and Santa Fe Railway switches a passenger train in Amarillo, Texas
Type and origin
Power typeDiesel-electric
BuilderBaldwin Locomotive Works
ModelDS-4-4-750
Build dateJuly 1949 to February 1951
Total produced53
Specifications
Configuration:
​
 • AARB-B
 • UICB′B′
Gauge4 ft 8+1⁄2 in (1,435 mm)
Prime mover606NA
RPM range625 rpm max.
Engine typeFour-stroke diesel
AspirationNormally aspirated, solid injection
Displacement1,979 cu in (32.43 L) per cylinder
11,874 cu in (194.58 L) total
GeneratorDC generator
Traction motorsDC traction motors
CylindersStraight-6
Cylinder size12+3⁄4 in × 15+1⁄2 in (324 mm × 394 mm)
TransmissionElectric
Loco brakeAir
Train brakesAir
Performance figures
Power output750 hp (559 kW)
Career
LocaleNorth America

Original owners
RailroadQuantityRoad NumbersNotes
Baldwin Locomotive Works (plant)
1
301
to Weyerhaeuser Timber Company 301 in 1956; became Texas South-Eastern 301, now R.J. Corman (Texas Line) 301
Baldwin Locomotive Works (demonstrators)
2
750–751
to Weyerhaeuser Timber Company 101–102
American Cyanamid Company
1
14
American Steel and Wire Company
1
20
Atchison, Topeka and Santa Fe Railway
9
525–533
California Western Railroad
2
51–52
Erie Railroad
4
386–389
Pennsylvania Railroad
24
5595–5618
Texas Mexican Railway
2
509–510
Warner Sand and Gravel
1
14
This locomotive is now on the Allentown and Auburn Railroad in Topton PA undergoing restoration
Youngstown Sheet and Tube
6
608–610, 700–702
Total53

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.

References
  • Kirkland, John F. (November 1994). The Diesel Builders volume 3: Baldwin Locomotive Works. Pasadena, California: Interurban Press. ISBN 0-916374-93-9.
  • Dolzall, Gary W. and Stephen F. (1984). Diesels From Eddystone: Baldwin Diesel Locomotives. Milwaukee,Wisconsin: Kalmbach Books. ISBN 0-89024-052-3.
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