The Baldwin DRS-4-4-1000 was a diesel-electric road switcher produced by the Baldwin Locomotive Works from July, 1948–March, 1950. The units featured a 1,000 horsepower (750 kW), six-cylinder prime mover, and were configured in a B-B wheel arrangement mounted atop a pair of two-axle AAR Type-B road trucks, with all axles powered. They had a cast steel frame. The units were configured to normally run with the long hood in the forward position.

Baldwin DRS-4-4-1000
Canadian Pacific Railway #8010.
Type and origin Power type Diesel-electric Builder Baldwin Locomotive Works Model DRS-4-4-1000 Build date July 1948 — March 1950 Total produced 22
Specifications Configuration: ​  • AAR B-B Gauge 4 ft 8+1⁄2 in (1,435 mm) standard gauge Prime mover 606SC RPM range 625 rpm maximum Engine type Straight-6 Four-stroke diesel Aspiration Turbocharger Elliott Company BF34 (125 hp) Displacement 1,979 cu in (32.43 L) per cylinder 11,874 cu in (194.58 L) total Generator Westinghouse YG42A Traction motors Westinghouse 340F (4) Cylinders 6 Cylinder size 12+3⁄4 in × 15+1⁄2 in (324 mm × 394 mm) Transmission Electric Loco brake Straight air Train brakes Air
Performance figures Power output 1,000 hp (750 kW)
Career Operators Pennsylvania Railroad, Esquimalt and Nanaimo, Penn Central Locale North America

Only 9 were built for American railroads, with another 13 manufactured in January and February, 1949 by the Canadian Locomotive Company for the Esquimalt and Nanaimo Railway, the first railroad in Canada to dieselize its locomotive fleet. The DRS-4-4-1000 was (in most cases) visually indistinguishable from its 1,200 horsepower (890 kW) successor, the RS-12. Only one intact example of the DRS-4-4-1000 is known to exist today (former CPR #8000), and is currently on display in Squamish, British Columbia.