EMD SD40T-2
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. 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. 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 fuel tank and is long. Rio Grande's version has a smaller fuel tank.
Original purchasers
Preservation
- Denver and Rio Grande Western #5371 is preserved at the Utah State Railroad Museum in Ogden, Utah.
- Denver and Rio Grande Western #5401 is preserved at the Colorado Railroad Museum in Golden, Colorado.
- From 2010 to 2019, Union Pacific #2921 was preserved at the Boone and Scenic Valley Railroad in Boone, Iowa. In 2020, the locomotive was traded to Midwest Locomotive Leasing for general service.