EMD SD9

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Technical Specifics

The EMD SD9 was the second locomotive produced under Electro-Motive Division's SD, or Special Duty, line, following the earlier SD7. Production ran from January 1954 through June 1959, during which time EMD built 471 units for domestic American railroads along with an additional 44 locomotives for export markets. The SD9 occupied essentially the same role in EMD's catalog that the GP9 did among four-axle road units, and in fact the SD9 was a direct six-axle adaptation of the GP9, just as the SD7 had been derived from the GP7. The extended C-C wheel arrangement gave the SD9 meaningfully greater tractive effort and distributed the locomotive's weight more evenly along the track compared to the four-axle GP series, making it well suited to branch lines and grades where adhesion was at a premium. The SD9 found buyers among numerous American railroads that valued its pulling power on demanding territory, and the type remained a workhorse on many rosters through the 1960s and into the 1970s. Most Class I carriers retired or traded in their SD9 fleets during the 1970s and 1980s as newer, more powerful models became available, but the locomotives proved durable enough to migrate in considerable numbers to short line and regional operators, where many continued earning revenue well into the twenty-first century. Southern Pacific undertook a substantial rebuilding effort known as the General Rehabilitation and Improvement Program, through which 144 of its SD9s were upgraded to SD9E specification between August 1970 and March 1980, with the majority renumbered into the 4300 to 4441 series. Norfolk Southern later rebuilt a small number of SD7s and SD9s into SD9m units, operating that handful of locomotives in service from 1989 through 2010. The SD9 was succeeded in EMD's lineup by the SD18, which entered production in 1960 and offered incremental improvements over its predecessor. Despite being out of production for decades, the SD9 left a lasting footprint on American railroading, and preserved examples can be found at museums and on tourist railroads across the country, while a number of units remain operational on active short line properties.

Model Train Manufacturers

Brands that produce EMD SD9 in HO scale

Prototype Reference

Real-world information about this equipment type

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