EMD GP40X

Specifications
Configuration:;
• AAR	B-B
Gauge	4 ft 8 1⁄2 in (1,435 mm) standard gauge
Prime mover	EMD 645F
Engine type	V16 diesel
Cylinders	16

Type and origin
Power type	Diesel-electric
Builder	General Motors Electro-Motive Division (EMD)
Model	GP40X
Build date	1977 – 1978
Total produced	23

EMD GP40X
	UP 957 was originally UP 9003. This shows the optional HT-B trucks.
Type and origin
Power type	Diesel-electric
Builder	General Motors Electro-Motive Division (EMD)
Model	GP40X
Build date	1977 – 1978
Total produced	23
Specifications
Configuration:;
• AAR	B-B
Gauge	4 ft 8 1⁄2 in (1,435 mm) standard gauge
Prime mover	EMD 645F
Engine type	V16 diesel
Cylinders	16
Performance figures
Power output	3,500 hp (2.61 MW)
Career
Locale	North America

An EMD GP40X is a 4-axle road switcher diesel-electric locomotive built by General Motors Electro-Motive Division between December 1977 and June 1978. Power for this unit was provided by a turbocharged 16-cylinder EMD 645F engine which could produce 3,500 horsepower (2,610 kW). 23 examples of this locomotive were built for North American railroads. This unit was a pre-production version meant to test technologies later incorporated into EMD's 50-series locomotives GP50 and SD50. Ten GP40X were delivered with an experimental HT-B truck design that became an option (but never used) on the production GP50.

The designation GP40X was also given to an experimental locomotive built on an EMD GP35 frame in May 1965. Only one example of this locomotive was ever produced, the EMD 433A, a 3,000 hp (2,240 kW) test prototype that was the first 4-axle locomotive to be powered by the new 645-series prime mover. The 433A served as the precursor to the EMD GP40. The 433A was purchased by the Illinois Central Railroad, and became the IC 3075. The 1965 EMD 433A has very little in common with the 1977 GP40X other than flared radiators and a 645-series prime mover.

Original owners

EMD GP40X Locomotives
Railroad	Quantity	Road numbers	Truck Type	Notes
Atchison, Topeka and Santa Fe	10	3800-3809	Blomberg M	3800 Locotrol Master 3801 Locotrol Receiver
Southern Pacific Railroad	2	7200-7201	HT-B	Locotrol Masters; Delivered with "Elephant ear" intake screens
Southern Pacific Railroad	2	7230-7231	HT-B	Locotrol Receivers; Delivered with "Elephant ear" intake screens
Southern Railway	3	SOU 7000-7002	Blomberg M	Hi-nose
Union Pacific Railroad	6	9000-9005	HT-B

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External links

Sarberenyi, Robert. EMD GP40X Original Owners. Retrieved on August 27, 2006
Thompson, J. David. EMD GP35 Original Owners, GP40 Prototype. Retrieved on August 27, 2006
Kristopans, Andre J. http://utahrails.net/ajkristopans/50SERIES.htm

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