EMD GP40X

Infobox Locomotive
name=EMD GP40X


caption= UP 957 was originally UP 9003
powertype=Diesel-electric
gauge=RailGauge|ussg
builder=General Motors Electro-Motive Division (EMD)
buildmodel=GP40X
builddate=1977 – 1978
aarwheels=B-B
cylindercount=16
primemover=EMD 645F
poweroutput=3,500 hp (2.6 MW)
totalproduction=23
locale=North America
An EMD GP40X is a 4-axle diesel 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 (2,600 kilowatts). 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 EMD SD50 and EMD GP50. Ten GP40X were delivered with an experimental HT-B truck design that became an option (but never used) on the production EMD 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 3000hp 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

External links

* Sarberenyi, Robert. " [http://users.inna.net/~jaydeet/gp40x.htm EMD GP40X Original Owners] ". Retrieved on August 27, 2006

* Thompson, J. David. " [http://users.inna.net/~jaydeet/gp35.htm EMD GP35 Original Owners, GP40 Prototype] ". Retrieved on August 27, 2006