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EMD SD45X Diesel-Electric Locomotive
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 Americanrailroads. 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
Owner: EMD 
Quantity: 1
Road Number: 4201
Date: 6/70
Builders Number: 36806
Notes: EMD demo, to SP 9503, 12/72

Owner: EMD 

Quantity: 2
Road Numbers: 4202, 4203
Date: 2/71
Builders Numbers: 36807, 36808
Notes: EMD demo, to SP 9504-9505, 12/72

Owner: EMD 

Quantity: 1
Road Number: 5740
Date: 6/70
Builders Number: 34123

Owner: Southern Pacific 

Quantity: 1
Road Number: 9500
Date: 8/70
Builders Number: 35741

Owner: Southern Pacific 

Quantity: 2
Road Numbers: 9501, 9502
Date: 9/70
Builders Numbers: 35742, 35743

EMD SD45X Overview
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
​ • 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)
Locale: United States

See also:

Electro Motive Diesel

EMD Diesel-Electric Locomotives

Diesel-Electric Locomotives


Southern Pacific

EMD logo

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EMD SD45X No. 4201.

EMD SD45X No. 4201.
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