Baldwin-Lima-Hamilton RS-12 Diesel-Electric Locomotive
The Baldwin RS-12 railroad locomotive was a 1,200 hp (895 kW) diesel-electric road-switcher configured with an AAR type B-B wheel arrangement. It was the follow-on model to the 1,000 hp DRS-4-4-1000, first introduced in 1948. It was more successful than its predecessor selling 50 units to eight railroads, versus 22 units to three railroads. Only one railroad, The Pennsylvania Railroad bought both models.

When Baldwin Locomotive Works merged with Lima-Hamilton the combination Baldwin-Lima-Hamilton decided to concentrate locomotive production at Baldwin's Eddystone, Pennsylvania plant. There was still one outstanding order for Lima LRS-1200s, but the customer, New York Central Railroad agreed to receive RS-12s instead.

The locomotive could be ordered with either a steam generator for steam heat, or dynamic brakes contained within the short hood. McCloud River Railroad No. 32 and 33 were the only two ordered with dynamic brakes of the fifty units built. One survives and is preserved in operational condition in the "Skunk Train" livery of California Western 56 (Locomotive) at Travel Town Museum in Griffith Park.

Original buyers

Central Railroad of New Jersey
Quantity:  4
Road Numbers:  1206–1209

Chicago, Milwaukee, St. Paul and Pacific Railroad (“Milwaukee Road”)
Quantity:  2
Road Numbers:  970–971
Notes:  Renumbered 926–927.

Durham and Southern Railway
Quantity:  3
Road Numbers:  1200–1202

Kaiser Bauxite Company
Quantity:  4
Road Numbers:  101–104

McCloud River Railroad
Quantity:  2
Road Numbers:  32–33
Notes:  to California Western 55– 56.

New York Central Railroad
Quantity:  17
Road Numbers:  5820–5836
Notes:  Renumbered 6220–6236.

Pennsylvania Railroad
Quantity:  8
Road Numbers:  8105–8110, 8776, 8975

Seaboard Air Line Railroad
Quantity:  10
Road Numbers:  1466–1475
Notes:  to Seaboard Coast Line Railroad 207–216.

Total Quantity:  50

Baldwin RS-12 Overview
Type and origin
Power type: Diesel-electric
Builder: Baldwin Lima Hamilton Corporation
Mode:l RS-12
Build date: April 1951–May 1956
Total produced: 50
​ • AAR B-B
 • UIC Bo′Bo′
Gauge: 4 ft 8 1⁄2 in (1,435 mm)
Length: 58 ft 6 in (17.83 m)
Width: 10 ft 0 in (3.05 m)
Height: 14 ft 0 in (4.27 m)
Locomotive weight: 232,000 lb (105,000 kg)
Fuel capacity: 900 US gal (3,400 l; 750 imp gal)
Lubricant capacity: 160 US gal (610 l; 130 imp gal)
Coolant capacity: 250 US gal (950 l; 210 imp gal)
Sandbox capacity: 30 cu ft (0.85 m3)
Prime mover: Baldwin 606A
Engine type: Four-stroke diesel
Aspiration: Turbocharged
Displacement: 11,874 cu in (195 L)
Generator: DC generator
Traction motors: DC traction motors
Cylinders: In-line 6
Cylinder size: 12 3⁄4 in × 15 1⁄2 in (324 mm × 394 mm)
Transmission: Electric
Locomotive brake: Straight air
Train brakes: Air 6-SL, or 24-RL
Performance figures
Maximum speed 18:74 gear ratio: 65 mph (105 km/h)
Maximum speed 18:65 gear ratio: 75 mph (121 km/h)
Power output: 1,200 hp (895 kW)

See also:

Baldwin Diesels

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Baldwin-Lima-Hamilton logo

A preserved Baldwin RS-12 at the Travel Town Museum.
By Klaus Nahr - Flickr: USA 2012 0238 - Los Angeles - Travel Town, CC BY-SA 2.0,

A preserved Baldwin RS-12 at the Travel Town Museum.