EMD SD45X

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.

Original owners
Qty.RailroadRoad NumbersDateBuilders #sNotes
1EMD42016/7036806EMD demo, to SP 9503, 12/72
2EMD4202, 42032/7136807, 36808EMD demo, to SP 9504-9505, 12/72
1EMD57406/7034123
1Southern Pacific95008/7035741
2Southern Pacific9501, 95029/7035742, 35743
EMD SD45X
Southern Pacific No. 9502 leads a freight train through the Donner Pass in 1980
Type and origin
Power typeDiesel-electric
BuilderGeneral Motors Electro-Motive Division (EMD)
ModelSD45X
Build dateJune 1970 to February 1971
Total produced7
Specifications
Configuration:
​
 • AARC-C
 • UICCo'Co'
Gauge4 ft 8 1⁄2 in (1,435 mm) standard gauge
Prime moverEMD 20-645E3A
Engine typeV20 diesel
Cylinders20
Performance figures
Power output4,200 hp (3,130 kW)
Career
LocaleUnited 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
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