EMD SD45X

4 ft 8+1⁄2 in (1,435 mm) standard gaugePrime moverEMD 20-645E3AEngine typeV20 dieselCylinders20

Performance figures
Power output	4,200 hp (3,130 kW)

Career
Locale	United States

An EMD SD45X is a 6-axle experimental diesel-electric locomotive built by General Motors Electro-Motive Division between June 1970 and February 1971. Power was provided by an EMD 645E3A 20-cylinder engine which generated 4,200 horsepower (3,130 kW).

History

A total of 7 units were ever built. 6 of these units would end up in service with Southern Pacific Railroad. One was rebuilt in 1980 by Morrison-Knudsen into an SD45Xm with a long hood from a scrapped DD35.

Original buyers

Qty.	Railroad	Road Numbers	Date	Builders #s	Notes
1	EMD	4201	6/70	36806	EMD demo, to SP 9503, 12/72
2	EMD	4202, 4203	2/71	36807, 36808	EMD demo, to SP 9504-9505, 12/72
1	EMD	5740	6/70	34123
1	Southern Pacific	9500	8/70	35741
2	Southern Pacific	9501, 9502	9/70	35742, 35743

References

• Pinkepank, Jerry A. (1973). The Second Diesel Spotter's Guide. Milwaukee, Wisconsin: Kalmbach Publishing. ISBN 978-0-89024-026-7.

Further reading

• Strapac, Joseph A. (November 1970). "Espee's SD-45X's". Pacific News. No. 109. pp. 3–5. ISSN 0030-879X. Archived from the original on November 3, 2018.