EMD SD40X

Kansas City Southern 701, an SD40X

An EMD SD40X is an 6-axle diesel-electric locomotive built by General Motors Electro-Motive Division between 1964 and 1965. 9 examples of this locomotive were built for test purposes to test the new 645-series prime mover. After testing, eight were sold to the Union Pacific Railroad and one example to the Gulf, Mobile and Ohio Railroad. This locomotive is an experimental testbed for the production SD40, 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 frame. 4 examples of this SD40X were built in 1979 and were delivered to the Kansas City Southern as KCS 700-703.

External links

Thompson, J. David. EMD SD35, SD40X (Prototypes) and related models Original Owners

6- and 8-axle diesel-electric locomotives built by GM-EMD
Six-axle road power	SD7 SD9 SD18 SD24 SD28 SD30C-ECO SD32ECO SD35 SDP35 SD38 SD38AC SD38-2 SD39 SDL39 SD40 SD40X SD40A SD40-2 SD40-2W SD40T-2 SD40-2S SDP40 SDP40F SD45 SD45X SD45-2 SD45T-2 SDP45 SD50 SD50F SD60 SD60F SD60I SD60M SD70 SD70I SD70M SD70MAC SD70M-2 SD70ACe SD75M SD75I SD80MAC SD89MAC SD90MAC
Eight-axle road power	DD35 DD35A DDA40X DDM45
See also: List of GM-EMD locomotives

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