The SD40T-2 is a model of

diesel-electric locomotive A diesel locomotive is a type of railway locomotive in which the power source is a diesel engine. Several types of diesel locomotives have been developed, differing mainly in the means by which mechanical power is conveyed to the driving whee ...

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 The SD45T-2 is a model of diesel-electric locomotive built by Electro-Motive Diesel, EMD for the Southern Pacific Railroad. Like the later EMD SD40T-2, SD40T-2 it is colloquially nicknamed a tunnel motor. 247 total units (including the original E ...

are popularly called tunnel motors, but EMD's term is

SD40-2 The EMD SD40-2 is a C-C diesel–electric locomotive built by EMD from 1972 to 1989. The SD40-2 was introduced in January 1972 as part of EMD's '' Dash 2'' series, competing against the GE U30C. Although higher-horsepower locomotives were av ...

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. EMD SD45T-2 vs SD40T-2 radiator fan motor access doors

EMD SD45T-2 vs SD40T-2 radiator fan motor access doors

This locomotive model was purchased by the

Denver and Rio Grande Western Railroad The Denver and Rio Grande Western Railroad , often shortened to ''Rio Grande'', D&RG or D&RGW, formerly the Denver & Rio Grande Railroad, was an American Class I railroad company. The railroad started as a narrow-gauge line running south fr ...

, the

Southern Pacific Railroad The Southern Pacific (or Espee from the railroad initials) was an American Railroad classes#Class I, Class I Rail transport, railroad network that existed from 1865 to 1996 and operated largely in the Western United States. The system was oper ...

, and its subsidiary

Cotton Belt The Cotton Belt is a region of the Southern United States where cotton was the predominant cash crop from the late 19th century into the 20th century.

. 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 Ogden ( ) is a city in and the county seat of Weber County, Utah, Weber County, Utah, United States, approximately east of the Great Salt Lake and north of Salt Lake City. The population was 87,321 in 2020, according to the United States Census ...

. *Denver and Rio Grande Western #5401 is preserved at the

Colorado Railroad Museum The Colorado Railroad Museum is a non-profit railway museum, railroad museum. The museum is located along the former Colorado and Southern Railway line on at a point where Clear Creek (Colorado), Clear Creek flows between North and South Table ...

Golden, Colorado Golden is a home rule city that is the county seat of Jefferson County, Colorado, United States. The city population was 20,399 at the 2020 United States census. Golden lies along Clear Creek at the base of the Front Range of the Rocky Moun ...

. *From 2010 to 2019,

Union Pacific The Union Pacific Railroad is a Class I freight-hauling railroad that operates 8,300 locomotives over routes in 23 U.S. states west of Chicago and New Orleans. Union Pacific is the second largest railroad in the United States after BNSF, ...

#2921 (formerly Southern Pacific #8385) was preserved at the

Boone and Scenic Valley Railroad The Boone and Scenic Valley Railroad is a heritage railroad that operates freight and passenger excursions in Boone County, Iowa. History The heritage and excursion railroad was begun in 1983 by a group of volunteers who wanted to preserve a sc ...

Boone, Iowa Boone ( ) is a city in Des Moines Township, Boone County, Iowa, Des Moines Township, and county seat of Boone County, Iowa, United States. It is the principal city of the Boone, Iowa Micropolitan Statistical Area, which encompasses all of Boone ...

. In 2020, the locomotive was traded to Midwest Locomotive Leasing (MWLX) for general service. SD40-2 vs SD40T-2

References

External links

* {{DEFAULTSORT:Emd Sd40t-2 SD40T-2 C-C locomotives Diesel–electric locomotives of the United States Railway locomotives introduced in 1974 Freight locomotives Standard-gauge locomotives of the United States Denver and Rio Grande Western Railroad locomotives Southern Pacific Railroad locomotives fi:EMD SD40#EMD SD40T-2