EMD SD40T-2
SP 8238 eastbound at Caliente, California, in the late 1980s
Type and origin
Power typeDiesel-electric
BuilderGeneral Motors Electro-Motive Division
Build dateJune 1974 – July 1980
Total produced312
Specifications
Configuration:
​
 • AARC-C
Gauge4 ft 8+1⁄2 in (1,435 mm) standard gauge
Length70 ft 8 in (21.54 m)
Width10 ft 3 in (3.12 m)
Height15 ft 7.5 in (4.763 metres)
Loco weight368,000 lb (167,000 kg)
Fuel capacity4,400 US gal (16,700 L; 3,660 imp gal)
Prime moverEMD 645E3
Engine typeV16 diesel
Cylinders16
Performance figures
Power output3,000 hp (2,240 kW)
Tractive effort92,000 lbf (410 kN) (starting)
82,000 lbf (360 kN) (continuous)
Career
OperatorsSouthern Pacific (and Cotton Belt), Rio Grande, Union Pacific
Nicknames"tunnel motors"
LocaleUnited States
Dispositionmost still in service as of 2010

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 3,000 horsepower (2,240 kW). 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.

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 Southern Pacific Railroad, and its subsidiary Cotton Belt. Southern Pacific's version has a 4,400-US-gallon (16,700 L; 3,660 imp gal) fuel tank and is 70 feet 8 inches (21.54 m) long. Rio Grande's version has a smaller 4,000-US-gallon (15,100 L; 3,330 imp gal) fuel tank.

Original purchasers

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 at Cajon Pass and sold for parts, then scrapped.
Comparison between an EMD SD40T-2 (left) and SD40-2 (right)

References

  1. ↑ Guss, Chris (January 1, 2018). "Tunnel (motors) from the past | Trains Magazine". TrainsMag.com. Retrieved 2019-02-13.
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