| EMD SD40T-2 | |
| Powertype: | Diesel-electric |
| Aarwheels: | C-C |
| Buildmodel: | SD40T-2 |
| Builder: | General Motors Electro-Motive Division |
| Cylindercount: | 16 |
| Primemover: | EMD 16-645E3 |
| Enginetype: | V16 diesel |
| Poweroutput: | 3000lk=inNaNlk=in |
| Tractiveeffort: | 92000abbr=onNaNabbr=on (starting) 82000abbr=onNaNabbr=on (continuous) |
| Fuelcap: | 4400usgal |
| Length: | 70inchesft8inchesin (ftin) |
| Height: | 15inchesft7.5inchesin (ftin) |
| Width: | 10inchesft3inchesin (ftin) |
| Locoweight: | 368000lbs |
| Totalproduction: | 312 |
| Builddate: | June 1974 - July 1980 |
| Nicknames: | "tunnel motors" |
| Operator: | Southern Pacific (and Cotton Belt), Rio Grande, Union Pacific |
| Disposition: | most still in service as of 2010 |
| Locale: | United States |
The SD40T-2 is a model of diesel-electric locomotive built by General Motors Electro-Motive Division in the United States. The SD40T-2 is equipped with a 16-cylinder EMD 645E3 diesel engine producing 3000hp. 312 SD40T-2s were built for three railroads in the United States between April 1974 and July 1980. This locomotive and the SD45T-2 are popularly called tunnel motors, but EMD's term is SD40-2 with "cooling system modifications" because they were designed for better engine cooling in mountainous areas.[1] The difference between this locomotive and its non-tunnel motor cousin, the SD40-2, are the radiator air intakes are located lower down at the rear of the locomotive.
This locomotive model was purchased by the Denver and Rio Grande Western Railroad, the Southern Pacific Railroad, and its subsidiary Cotton Belt. Southern Pacific's version has a 4400adj=onNaNadj=on fuel tank and is 70feet long. Rio Grande's version has a smaller 4000usgal fuel tank.
| Railroad | Quantity | Road numbers | Notes | |
|---|---|---|---|---|
| Denver and Rio Grande Western Railroad | 73 | 5341-5413 | All with 81 in. or 88 in. short noses. | |
| St. Louis Southwestern Railway (Cotton Belt) | 10 | 8322-8326, 8372-8376 | "snoot noses" | |
| Southern Pacific Railroad | 229 | 8230-8299, 8300-8321, 8327-8341 8350-8371, 8377-8391, 8489-8573 | 8300 series featured extended "snoot" noses for radio control equipment. 8278 was damaged beyond repair in the 1989 Cajon Pass runaway and sold for parts, then scrapped. | |
| Totals | 312 |