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SP 8238 CA Caliente.jpg
SP 8238, eastbound at Caliente, California, in the late 1980s
Type and origin
Power type Diesel-electric
Builder General Motors Electro-Motive Division
Build date June 1974 – July 1980
Total produced 312
AAR wheel arr. C-C
Gauge 4 ft 8 12 in (1,435 mm)
Length 70 ft 8 in (21.54 m)
Fuel capacity 4,400 US gal (16,700 l; 3,660 imp gal)
Prime mover EMD 645E3
Cylinders V16
Performance figures
Power output 3,000 hp (2,240 kW)
Operator(s) Southern Pacific (and Cotton Belt), Rio Grande, Union Pacific
Nicknames "tunnel motors"
Locale western United States
Disposition most still in service as of 2010

An SD40T-2 is a 6-axle diesel-electric locomotive built by General Motors Electro-Motive Division having a 16-cylinder EMD 645E3 diesel engine producing 3,000 horsepower (2,240 kW). 312 SD40T-2s were built for North American railroads between April 1974 and July 1980. This locomotive and the SD45T-2 are popularly called tunnel motors, but EMD's term is SD40-2s with "cooling system modifications" because they were designed for better engine cooling in tunnels. The difference between this locomotive and its non-tunnel motor cousin, the SD40-2, are the radiator intakes and radiator fan grills located at the rear of the locomotive. The radiator air intakes in this model were along the deck to allow more fresh, cooler air to enter and less hot exhaust fumes lingering around the tunnel's ceiling.

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) 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. After merging with Rio Grande, the Southern Pacific and later Union Pacific owned every SD40T-2.

In 2005, most of these units were owned by Union Pacific or leasing companies. By 2008, none were left in service on UP with SP or DRGW reporting marks. DRGW 5371 was the last one, retired in March 2008, and now resides at the Utah State Railroad Museum in Ogden Utah. UP still runs many units repainted in its own livery.

Original purchasers[edit]

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.

Other owners[edit]

Railroad Quantity Road numbers Notes
Alabama & Tennessee River 3 2832, 2842, & 5387 2832 & 2842 still in UP yellow. 5387 still in "Bloody nose" paint lost speed lettering as of 5-10-11
America Latina Logistica
Fort Worth and Western Railroad 3 2015-2017, 3252
Buffalo & Pittsburgh 2 3301 & 3302 Both still in KCS Grey
Ferrovia Centro Atlântico (Brazil) Rebuilt as metre gauge BB40T-2s
Kansas City Southern Rebuilt as SD40-3s
MNA (Missouri & Northern Arkansas Railroad)
New York Susquahanna & Western 4 3010, 3012, 3014, 3016 All units wear Susquehanna "Yellow Jacket" paint. 3014 has "snoot" nose, all others have 88" noses.
Respondek Rail Corporation (Squaw Creek Southern Railroad) 1 8795 Former UP 8795 & SP 8246
R.J. Corman 9 5353, 5361, 5372, 5409, 8307, 8336, 8569, 8718, 8861
Terminal Railroad Association (TRRA) 3001,3005
Union Pacific Most if not all Retired by now
Wheeling & Lake Erie 2 5391, 5413 Still in D&RGW paint
Independent Locomotive Service (ILSX) 1 1343 Former UP 2906, UP 4429, & SP 8371

External links[edit]