The EMD SD40X is a 6-axle experimental

diesel-electric locomotive A diesel locomotive is a type of railway locomotive in which the power source is a diesel engine. Several types of diesel locomotives have been developed, differing mainly in the means by which mechanical power is conveyed to the driving whee ...

built by General Motors Electro-Motive Division between 1964 and 1965. Nine examples of this locomotive were built for test purposes to test the new 645-series prime mover 16-645E3. After testing, eight were sold to the

Union Pacific Railroad The Union Pacific Railroad is a Railroad classes, Class I freight-hauling railroad that operates 8,300 locomotives over routes in 23 U.S. states west of Chicago and New Orleans. Union Pacific is the second largest railroad in the United Stat ...

and one example to the

Gulf, Mobile and Ohio Railroad The Gulf, Mobile and Ohio was a Class I railroad in the central United States whose primary routes extended from Mobile, Alabama, and New Orleans, Louisiana, to St. Louis, Missouri, St. Louis and Kansas City, Missouri, as well as Chicago, Illin ...

. This locomotive is an experimental testbed for the production

SD40 SD40 may refer to: * Canon PowerShot SD40, a digital camera * EMD SD40, a diesel-electric locomotive * South Dakota Highway 40 * SD-40 alcohol, ethanol denatured alcohol, denatured by adding denatonium benzoate * School District 40 New Westminster, ...

, but built on the shorter SD35 frame. This locomotive was also known as an SD35X. The designation SD40X was also given to an experimental version of the SD50, built by EMD on an

SD40-2 The EMD SD40-2 is a C-C diesel–electric locomotive built by EMD from 1972 to 1989. The SD40-2 was introduced in January 1972 as part of EMD's '' Dash 2'' series, competing against the GE U30C. Although higher-horsepower locomotives were av ...

frame. Four examples of this SD40X were built in 1979 and were delivered to the Kansas City Southern as KCS 700-703.

Original owners

References

* *

External links

* Thompson, J. David.
EMD SD35, SD40X (Prototypes) and related models Original Owners
' {{diesel-loco-stub SD40X C-C locomotives Experimental locomotives Diesel–electric locomotives of the United States Union Pacific Railroad locomotives Railway locomotives introduced in 1964

Original owners

References

See also

External links