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 |
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![](//upload.wikimedia.org/wikipedia/commons/thumb/c/c1/SP_9502_in_the_Donner_Pass.jpeg/300px-SP_9502_in_the_Donner_Pass.jpeg) Southern Pacific No. 9502 leads a freight train through the Donner Pass in 1980 |
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Performance figures |
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Power output | 4,200 hp (3,130 kW) |
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Original owners
Qty. |
Railroad |
Road Numbers |
Date |
Builders #s |
Notes
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1 |
EMD |
4201 |
6/70 |
36806 |
EMD demo, to SP 9503, 12/72
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2 |
EMD |
4202, 4203 |
2/71 |
36807, 36808 |
EMD demo, to SP 9504-9505, 12/72
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1 |
EMD |
5740 |
6/70 |
34123 |
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1 |
Southern Pacific |
9500 |
8/70 |
35741 |
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2 |
Southern Pacific |
9501, 9502 |
9/70 |
35742, 35743 |
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