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Kansas City Southern Railway EMD SD45T-2 No. 4504.

By terry cantrell - originally posted to Flickr as 4-13-2007-08, CC BY-SA 2.0,

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EMD SD45T-2 Diesel-Electric Locomotive
The SD45T-2 is a 6-axle diesel-electric locomotive built by EMD for the Southern Pacific Railroad. Like the later, SD40T-2 it is colloquially nicknamed a "tunnel motor". 247 total units (including the original EMD/SP joint venture working Prototype) were produced from February 1972 to June 1975, including 84 for SP's subsidiary St. Louis - Southwestern (Cotton Belt). From April 1986 to December 1989, 126 were rebuilt and re-designated as SD45T-2R, including 24 for Cotton Belt.

The SD45T-2 is a variant of the venerable SD45 that featured the "Dash 2" upgrade components such as improved electronics and high traction trucks, with the "T" denoting its cooling system modifications. The intake for radiator cooling air was moved to the walkway level and the cooling fans themselves were under the radiator cores, instead of above. Tunnel motors were built for mountainous areas in the western United States, where SP had previously encountered repeated overheating issues on their SD45s.

The later SD40T-2, looks similar to the SD45T-2. One spotting difference is the longer hood on the SD45T-2 to accommodate the V20 prime mover vs. the V16 used on the SD40T-2. The SD45T-2's cab is further forward on the frame, so there is less "front porch". This mimics the differences between the SD45-2 and the SD40-2. Another spotting difference is the SD45T-2's three fan access doors on each side above the cooling air intake, while the SD40T-2 has two.

Like their SD40T-2, some of SP's SD45T-2 tunnel motors were obtained by Kansas City Southern Railway, Bessemer and Lake Erie Railroad, Duluth, Missabe and Iron Range Railway, and by the Union Pacific Railroad when it merged the SP in 1996.

Some SD45T-2s were rebuilt and designated to SD45T-3, SD40T-3 and SD40-2T, in addition, some locomotive leasing companies own the SD45 tunnel motor locomotives. They are scattered all over the United States and are an increasingly rare sight.

As of January 2003, SD45T-2R SP No. 6819 (formerly SP 9193) was donated to the California State Railroad Museum in Sacramento, California.

EMD SD45T-2 Overview
Type and origin
Power type: Diesel-electric
Builder: General Motors Electro-Motive Division (EMD)
Model: SD45T-2
Build date: February 1972 – June 1975
Total produced: 247
​ • AAR C-C
Gauge: 4 ft 8 1⁄2 in (1,435 mm) standard gauge
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
Engine type: V20 diesel engine
Cylinders: 20
Performance figures
Power output: 3,600 hp (2,680 kW)
Nickname: "tunnel motor"
Disposition: many still in service as of 2010; one donated to California State Railroad Museum

See also:

Electro Motive Diesel

EMD Diesel-Electric Locomotives

Diesel-Electric Locomotives


Southern Pacific

St. Louis - Southwestern (Cotton Belt)

Historic Rail - Shop Now!
EMD SD45T-2 vs SD40T-2 radiator fan motor access doors.
Kansas City Southern Railway EMD SD45T-2 No. 4504.

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

By Ken L Whitehead - personal collection, CC BY-SA 3.0,