Baldwin RS-12

A preserved RS-12 at the Travel Town Museum.

Type and origin
Power type	Diesel-electric
Builder	Baldwin Lima Hamilton Corporation
Model	RS-12
Build date	April 1951–May 1956
Total produced	50

Specifications
AAR wheel arr.	B-B
UIC class	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)
Loco weight	232,000 lb (105,000 kg)
Fuel capacity	900 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 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
Loco brake	Straight air
Train brakes	Air 6-SL, or 24-RL

Performance figures
Maximum speed	18:74 gear ratio: 65 mph (105 km/h); 18:65 gear ratio: 75 mph (121 km/h)
Power output	1,200 hp (895 kW)

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

Railroad	Quantity	Road Numbers	Notes
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
Total	50

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.

Diesel locomotives built by the Baldwin Locomotive Works

Early units	Experimental units Baldwin pre-production switchers 4-8+8-4-750/8-DE

Switchers	VO-660 RS-4-TC DS-4-4-660 DS-4-4-750 S-8 VO-1000 DS-4-4-1000 S-12

Road switchers	DRS-4-4-1000 RS-12 DRS-4-4-1500 AS-16 DRS-6-4-1500 AS-416 DRS-6-6-1500 AS-616

Transfer units	DT-6-6-2000 RT-624

Cab units	DR-12-8-1500/2 DR-6 series DR-4-4-15 RF-16 RP-210

Export units	Soviet Railways ДБ20 DRS-6-4-660 DRS-6-4-750 DRS-6-4-1000 RF-615E

(See also: List of Baldwin diesel locomotives)

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