An EMD SD45X is a 6-axle experimental diesel-electric locomotive built by General Motors Electro-Motive Division between June 1970 and February 1971. Power was provided by an EMD 645E3A 20-cylinder engine which generated 4,200 horsepower (3,130 kW). 7 examples of this locomotive model were built for American railroads. 6 of these units would end up in service with Southern Pacific Railroad. One was rebuilt in 1980 by Morrison-Knudsen into an SD45Xm with a long hood from a scrapped DD35.

EMD SD45X
Southern Pacific No. 9502 leads a freight train through the Donner Pass in 1980
Type and origin Power type Diesel-electric Builder General Motors Electro-Motive Division (EMD) Model SD45X Build date June 1970 to February 1971 Total produced 7
Specifications Configuration: ​  • AAR C-C  • UIC Co'Co' Gauge 4 ft 8+1⁄2 in (1,435 mm) standard gauge Prime mover EMD 20-645E3A Engine type V20 diesel Cylinders 20
Performance figures Power output 4,200 hp (3,130 kW)
Career Locale United States

References

• Pinkepank, Jerry A. (1973). The Second Diesel Spotter's Guide. Milwaukee, Wisconsin: Kalmbach Publishing. ISBN 978-0-89024-026-7.
• Sarberenyi, Robert. EMD SD45X Original Owners. Retrieved on August 27, 2006

Further reading

• Strapac, Joseph A. (November 1970). "Espee's SD-45X's". Pacific News. No. 109. pp. 3–5. ISSN 0030-879X.

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