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EMD SD40X
Kansas City Southern 701
Type and origin Power type Diesel-electric Builder Electro-Motive Division Build date 1964-1965 1979 Total produced 13
Specifications Configuration: ​  • AAR C-C Gauge 4 ft 8+1⁄2 in (1,435 mm) Prime mover 645-series 16-645E3
Performance figures Power output 3,500 hp (2,600 kW) (KCS locomotives)

The EMD SD40X is a 6-axle experimental diesel-electric locomotive 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 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. Four examples of this SD40X were built in 1979 and were delivered to the Kansas City Southern as KCS 700-703.

References

1. Danneman 2024, p. .
2. Soloman 2000, p. 162.

• Danneman, Mike (15 Jan 2024). EMD Locomotives. Amberley Publishing Limited. ISBN 978-1398103207.
• Soloman, Brian (2000). American Diesel Locomotives. Voyageur Press. ISBN 1610606051.

External links

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

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