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The EMD SD9 six-axle diesel locomotive was the successor to the SD7 in EMD's catalog, developed alongside its 4-axle counterpart, the EMD GP9. The SD9 utilized a 16-567C prime mover generating 1,750 hp. It was relatively popular, with 171 units for US railroads, and 44 for export. 

These engines were built in 1954 by Electro-Motive Diesel.

Trivia[]

  • BNSF rosters several SD9s, with lowered hoods used for switching.
  • NS used to own four Algers, Winslow and Western SD9s which were former Central of Georgia units. The four NS SD9s have since been sold.
  • Some of the late production models had two 48-inch cooling fans like the SD18 and SD24 instead of four 36-inch cooling fans.
  • Some are still in service to this day.

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