AT&SF No. 631, a Baldwin DS4-4-750, switching Train 1, the San Francisco Chief at Amarillo, TX.
(Roger Puta, courtesy Marty Bernard, railfan 44, Public domain, via Wikimedia Commons)
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 locomotive 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.
Original owners
| Railroad | Quantity | Road numbers | Notes |
|---|---|---|---|
| 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 | |
| Total | 53 |
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.
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; 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
