EMD GP40X

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EMD GP40X
GP40X.jpg
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
AAR wheel arr. B-B
Gauge 4 ft 8 12 in (1,435 mm)
Prime mover EMD 645F
Cylinders V16
Performance figures
Power output 3,500 hp (2.61 MW)
Career
Locale North America

An EMD GP40X is a 4-axle diesel-electric locomotive built by General Motors Electro-Motive Division between 1977 and 1978. Power for this unit was provided by a turbocharged 16-cylinder EMD 645F (derivative of the EMD 645 series 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[edit]

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

External links[edit]