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UP 957 was originally UP 9003. This photo depicts the optional HT-B trucks. Shown here on the dead line at Houston, Texas, April 2002.

By KLWhitehead - Own work, CC BY-SA 3.0,

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UP 957, a GP40X.
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EMD GP40X Diesel-Electric Locomotive
An EMD GP40X is a 4-axle 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.

EMD GP40X Locomotives - Original Owners 

Railroad: Atchison, Topeka and Santa Fe

Quantity: 10
Road numbers: 3800-3809
Truck Type: Blomberg M
Notes: 3800 Locotrol Master, 3801 Locotrol Receiver

Railroad: Southern Pacific Railroad

Quantity: 2
Road numbers: 7200-7201
Truck Type: HT-B
Notes: Locotrol Masters; Delivered with "Elephant ear" intake screens.

Railroad: Southern Pacific Railroad

Quantity: 2
Road numbers: 7230-7231
Truck Type: HT-B
Notes: Locotrol Receivers; Delivered with "Elephant ear" intake screens.

Railroad: Southern Railway

Quantity: 3
Road numbers: SOU 7000-7002
Truck Type: Blomberg M
Notes: Hi-nose

Railroad: Union Pacific Railroad

Quantity: 6
Road numbers: 9000-9005
Truck Type: HT-B

EMD GP40X Overview
Type and origin
Power type: Diesel-electric
Builder: General Motors Electro-Motive Division (EMD)
Model: GP40X
Build date: 1977 – 1978
Total produced: 23
​ • 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)
Locale: North America

See also:

Electro Motive

EMD Diesel-Electric Locomotives

Diesel-Electric Locomotives