ALCO RS-2
Santa Fe Railway #2098
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| Type and origin | |
|---|---|
| Power type | Diesel-electric |
| Builder |
American Locomotive Company Montreal Locomotive Works |
| Model | RS-2 |
| Build date | October 1946 – February 1950 |
| Total produced | 378 |
| Specifications | |
|---|---|
| AAR wheel arr. | B-B |
| Gauge | 4 ft 8 1⁄2 in (1,435 mm) standard gauge |
| Trucks | AAR type B |
| Wheel diameter | 40 in (1,000 mm) |
| Minimum curve | 57° (104.79 ft or 31.94 m) |
| Wheelbase | 39 ft 4 in (11.99 m) |
| Length | 56 ft (17 m) |
| Width | 10 ft (3.0 m) |
| Height | 14 ft 5 in (4.39 m) |
| Loco weight | 249,600 lb (113,200 kg) |
| Fuel capacity | 800 US gal (3,000 L; 670 imp gal) |
| Prime mover | Alco 244-B |
| Engine type | V12 Four-stroke diesel |
| Aspiration | Turbocharger |
| Generator | GE 5GT-564B-1 |
| Traction motors | (4) GE 752-A |
| Cylinders | 12 |
| Cylinder size | 9 in × 10 1⁄2 in (229 mm × 267 mm) bore x stroke |
| Performance figures | |
|---|---|
| Power output | 1,500 hp (1.119 MW) @ 1,000rpm later models 1,600 hp (1.193 MW) |
| Tractive effort | 62,500 lb (28,300 kg) |
| Career | |
|---|---|
| Locale | North America |
The ALCO RS-2 is a 1,500 horsepower (1,100 kW), B-B road switcher diesel-electric locomotive. It was manufactured by American Locomotive Company (ALCO) from October 1946 to May 1950, and 378 were produced — 369 by the American Locomotive Company, and 9 by Montreal Locomotive Works in Canada. Eight of the ALCO RS-2s were exported to Canada. The RS-2 has a single, 12 cylinder, model 244 engine, developing 1,500 horsepower (1,100 kW). Thirty-one locomotives built by Alco between February and May 1950 with the 12 cylinder 244C 1,600 horsepower (1,200 kW) engine.
ALCO built the RS-2 to compete with EMD, Fairbanks-Morse, and Baldwin Locomotive Works. In 1947, Fairbanks-Morse introduced the 1,500 hp (1.1 MW) H-15-44. Also in that year, Baldwin introduced the 1,500 hp (1.1 MW) DRS-4-4-1500. In the case of ALCO, Fairbanks-Morse, and Baldwin, each company increased the power of an existing locomotive line from 1,500 to 1,600 hp (1.1 to 1.2 MW)), and added more improvements to create new locomotive lines.
EMD, however, kept its competing GP7 at 1,500 hp (1.1 MW) In 1954, EMD introduced the GP9. It was rated at 1,750 hp (1.30 MW).
EMD produced 2,734 GP-7s. ALCO produced 378 RS-2s, and 1,370 RS-3s. Fairbanks-Morse produced 30 H-15-44s, and 296 H-16-44s. Baldwin produced 32 DRS-4-4-1500s, and 127 AS-16s.
The RS2 was a further development of the road switcher concept. It had more horsepower than the RS1, and was better suited for heavy road service. Externally, the RS2 bodywork was more rounded, while mechanically the new 244 engine was introduced. A turbocharged four stroke V12 with a 9 in × 10 1⁄2 in (229 mm × 267 mm) bore and stroke developing 1,500 (later 1,600) hp at 1,000 rpm, it had a smaller cylinder, higher cylinder speed design than the 539 used in the RS1. Production of the RS-2 was delayed several months while Alco worked out the new four pipe divided low rise manifold for the GE constant pressure RD-1 turbocharger. The 244 engine was not a reliable design, however, and was replaced in less than ten years by the Alco 251 engine.
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Wikipedia