Baldwin S-12
A preserved S-12 at the Railroad Museum of Pennsylvania.
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| Type and origin | |
|---|---|
| Power type | Diesel-electric |
| Builder | Baldwin-Lima-Hamiton |
| Model | S-12 |
| Build date | January 1951–October 1956 |
| Total produced | 451 |
| Specifications | |
|---|---|
| AAR wheel arr. | B-B |
| Gauge | 4 ft 8 1⁄2 in (1,435 mm) standard gauge |
| Trucks | AAR Type A truck |
| Wheel diameter | 40 in (1,016 mm) |
| Minimum curve | 44° (133.47 ft or 40.68 m radius) |
| Wheelbase | 30 ft 8 in (9.35 m) |
| Length | 46 ft 6 1⁄4 in (14.18 m) |
| Width | 9 ft 11 1⁄4 in (3.03 m) |
| Height | 14 ft (4.2672 m) |
| Loco weight | 235,500 lb (106,800 kg) |
| Prime mover | 606A |
| RPM range | 625 rpm max |
| Engine type | Four-stroke diesel |
| Aspiration | Turbocharged |
| Displacement | 1,979 cu in (32.43 l) per cylinder 11,874 cu in (194.58 l) total |
| Generator | Westinghouse 480DC |
| Traction motors | (4) Westinghouse 362-D |
| Cylinders | 6 |
| Cylinder size | 12 3⁄4 in × 15 1⁄2 in (324 mm × 394 mm) |
| Performance figures | |
|---|---|
| Power output | 1,200 hp (895 kW) |
| Tractive effort | 57,500 lb (26,100 kg) |
| Career | |
|---|---|
| Disposition | 6 preserved, remainder scrapped |
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| Type and origin | |
|---|---|
| Power type | Diesel-electric |
| Model | DS-4-4-660 / DS-4-4-1000 |
| Build date | 660: June 1946 to May 1949 1000: January 1951 – November 1951 |
| Total produced | 660: 139 1000: 446 |
| Specifications | |
|---|---|
| AAR wheel arr. | B-B |
| Gauge | 4 ft 8 1⁄2 in (1,435 mm) standard gauge |
| Trucks | AAR Type A truck |
| Wheel diameter | 36 in (914 mm) |
| Minimum curve | 44° (133.47 ft (40.68 m) radius) |
| Wheelbase | 30 ft 8 in (9.35 m) |
| Length | 46 ft 6 1⁄4 in (14.18 m) |
| Width | 9 ft 11 1⁄4 in (3.03 m) |
| Height | 14 ft (4.27 m) |
| Loco weight | 660: 196,600 lb (89,200 kg) 1000: 230,000 lb (100,000 kg) |
| Prime mover | 660: Baldwin 606NA 1000: 608NA later 606SC |
| RPM range | 625 rpm max. |
| Engine type | 606: Straight-6 608: Straight-8 Four-stroke diesel |
| Aspiration | 606NA and 608NA: Natural 606SC: Turbocharged |
| Displacement | 1,979 cu in (32.43 l) per cylinder 606: 11,874 cu in (194.58 l) total 608: 15,832 cu in (259.44 l) total |
| Generator | West’hse 480 DC |
| Traction motors | (4) West’hse 362-D |
| Cylinders | 6 |
| Cylinder size | 12 3⁄4 in × 15 1⁄2 in (324 mm × 394 mm) |
| Loco brake | Air |
| Train brakes | Air |
| Performance figures | |
|---|---|
| Power output | 660: 660 hp (492 kW) 1000: 1,000 hp (746 kW) |
| Tractive effort | 660: 56,500 lb (25,600 kg) 1000: 57,500 lb (26,100 kg) |
| Career | |
|---|---|
| Locale | North America |
The Baldwin S-12 was a 1,200-horsepower (890 kW) diesel-electric locomotive intended for use in yard switching. Utilizing a turbocharged 6-cylinder version of the powerful 606A diesel prime mover, S-12s were known for their "lugging" power, despite being temperamental. Like most Baldwin switchers, the S-12 had AAR Type-A switcher trucks in a B-B wheel arrangement. 451 units were built between 1951 and 1956, when Baldwin left the locomotive market.
Baldwin made a number of switchers with similar dimensions and body styles. The first body style, used in VO models, had a slightly pointed nose with a round radiator opening. The second and third body style, almost indistinguishable and used interchangeably, had a flat nose and rectangular radiator opening. Various exhaust stacks were used, and are not an effective spotting feature, except that turbocharged models always had one large stack offset to the side.
The VO-660 was built between April 1939 and May 1946. It was powered by a naturally aspirated six cylinder engine rated at 600-horsepower (450 kW). 142 were built. Baldwin replaced the VO-660 with the model DS-4-4-660 in 1946.
The VO-1000 was built between January 1939 and December 1946. It was powered by a naturally aspirated eight cylinder engine rated at 1,000-horsepower (750 kW). Some had the Batz truck originally developed by the Atchison, Topeka and Santa Fe Railway as a leading truck for steam locomotives. 548 VO-1000s were built.
The DS-4-4-660 was built between 1946 and 1949. It replaced the 600-horsepower (450 kW) VO-660 as the low power companion to the DS-4-4-1000 models. 139 were built.
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Wikipedia