Baldwin RS-12

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.

Baldwin RS-12
A preserved RS-12 at the Travel Town Museum.
Type and origin
Power typeDiesel-electric
BuilderBaldwin Lima Hamilton Corporation
ModelRS-12
Build dateApril 1951–May 1956
Total produced50
Specifications
Configuration:
​
 • AARB-B
 • UICBo′Bo′
Gauge4 ft 8 1⁄2 in (1,435 mm)
Length58 ft 6 in (17.83 m)
Width10 ft 0 in (3.05 m)
Height14 ft 0 in (4.27 m)
Loco weight232,000 lb (105,000 kg)
Fuel capacity900 US gal (3,400 l; 750 imp gal)
Lubricant cap.160 US gal (610 l; 130 imp gal)
Coolant cap.250 US gal (950 l; 210 imp gal)
Sandbox cap.30 cu ft (0.85 m3)
Prime moverBaldwin 606A
Engine typeFour-stroke diesel
AspirationTurbocharged
Displacement11,874 cu in (195 L)
GeneratorDC generator
Traction motorsDC traction motors
CylindersIn-line 6
Cylinder size12 3⁄4 in × 15 1⁄2 in (324 mm × 394 mm)
TransmissionElectric
Loco brakeStraight air
Train brakesAir 6-SL, or 24-RL
Performance figures
Maximum speed18:74 gear ratio: 65 mph (105 km/h);
18:65 gear ratio: 75 mph (121 km/h)
Power output1,200 hp (895 kW)

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 RS-12 is preserved in operational condition in the "Skunk Train" livery of California Western 56 (Locomotive) at Travel Town Museum in Griffith Park; another is owned by and occasionally used on the Escanaba and Lake Superior Railroad, with others owned by the same railroad held in non-operational condition.

Original buyers
RailroadQuantityRoad NumbersNotes
Central Railroad of New Jersey
4
1206–1209
Chicago, Milwaukee, St. Paul and Pacific Railroad (“Milwaukee Road”)
2
970–971
Renumbered 926–927
Durham and Southern Railway
3
1200–1202
Kaiser Bauxite Company
4
101–104
McCloud River Railroad
2
32–33
to California Western 55– 56
New York Central Railroad
17
5820–5836
Renumbered 6220–6236
Pennsylvania Railroad
8
8105–8110, 8776, 8975
Seaboard Air Line Railroad
10
1466–1475
to Seaboard Coast Line Railroad 207–216
Total50

Sources
  • Kirkland, John F. (November 1985). The Diesel Builders Volume 1: Fairbanks-Morse and Lima-Hamilton. Interurban Press. ISBN 0-916374-69-6.
  • Kirkland, John F. (November 1994). The Diesel Builders volume 3: Baldwin Locomotive Works. Interurban Press. ISBN 0-916374-93-9.
  • Diesel Engine Manual DE-111 for 600 series engines, Manual DE-111. Baldwin Lima Hamilton Corp. June 1951.
  • Operator's Manual for Standard 1200-HP Diesel Electric Switching Locomotives, Manual S-120. Baldwin Lima Hamilton Corp. March 1956.


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