EMD SD90MAC
UP 8540, an SD90MAC Phase II
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| Type and origin | |
|---|---|
| Power type | Diesel-electric |
| Builder | Electro-Motive Diesels (EMD) |
| Specifications | |
|---|---|
| AAR wheel arr. | C-C |
| Gauge | 4 ft 8 1⁄2 in (1,435 mm) |
| Wheel diameter | 42 in (1,067 mm) |
| Length | 80 ft 2 in (24.43 m) |
| Loco weight | 415,000 lb (188,000 kg) |
| Fuel capacity | 5,800 US gal (22,000 l; 4,800 imp gal) |
| Sandbox cap | 40 cu ft (1.1 m3) |
| Prime mover | EMD 16-710 G3B or EMD 16-265H |
| RPM range | 225-1000 rpm |
| Engine type | V16 diesel |
| Traction motors | 6 Siemens 1TB2830 AC motors |
| Cylinders | 16 |
| Cylinder size | 10.45 in × 11.80 in (265 mm × 300 mm) |
| Performance figures | |
|---|---|
| Power output | 4,300 hp (3,210 kW) or 6,000 hp (4,470 kW) |
| Tractive effort | small engine: 185,000 lbf (822.92 kN) starting, 147,000 lbf (653.89 kN) continuous large engine: 200,000 lbf (889.64 kN) starting, 165,000 lbf (733.96 kN) continuous |
The EMD SD90MAC is a 6,000 hp (4,470 kW)C-C diesel-electric hood unit locomotive produced by General Motors Electro-Motive Division. It is, with the SD80MAC, one of the largest single-engined locomotives produced by that company, surpassed only by the dual-engined DDA40X.
The SD90MACs feature radial steering trucks with AC traction motors and an isolated safety cab which is mounted on shock absorbers to lessen vibrations in the cab. The SD90MAC, like the SD80MAC, SD70ACe, and SD70M-2, has a wide radiator section, nearly the entire width of the locomotive, which along with their size makes them easy to spot.
The SD90MAC was introduced in 1995, along with the SD80MAC locomotives. The SD90MAC was designed to utilize the new 16-cylinder H-engine, while the SD80MAC was designed to use the 20-cylinder version of the existing 710G engine. However, technical problems with the 6,000 horsepower (4,500 kW) engine resulted in the first locomotives being shipped with 4,300 hp (3,210 kW) 16-cylinder 710G engines, making them similar to the SD70MACs. These locomotives were given the informal model designation SD9043MAC by railroads that purchased them with the option to re-engine them with 6,000 hp (4,470 kW) engines when they became available. This upgrade program, however, was never taken advantage of by SD90MAC buyers due to reliability issues with the newer engine. Over 400 SD90MAC locomotives fitted with the 4,300 hp (3,210 kW) 710 engine were built.
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Wikipedia