EMD SD9

The SD9 was the second model of EMD's SD (special duty) line of locomotives, following the SD7. Just as the SD7 was a lengthened GP7 with two additional axles, the SD9 was a corresponding modification of the GP9. The additional axles in SD series locomotives provide more tractive effort and more even distribution of locomotive weight compared to the four axle GP series locomotives.[2]

SD9s can be distinguished from the similar looking SD7s by observing the position of the classification lights on the ends of the locomotive, above the number board. The SD9's classification lights are on a small pod, canted outward, while the SD7's classification lights are closer to the centerline and flush with the hood.[3]

The last phase of construction had a carbody similar to the SD18 and SD24, and used two 48-inch (1,219 mm) cooling fans instead of four 36-inch (914 mm) cooling fans.

EMD ended SD9 production in June 1959. It was succeeded by the SD18 which began production in 1960.

PNWR 1852 in Albany, Oregon

AERC 5399 in Albany, Oregon

Some SD9 locomotives can be found in museums and on tourist lines, and at least two are in service on a working railroad:

• Dakota Southern Railway used SD9 #506 and SD9E #4427 in revenue freight service.[4]
• BNSF 6125 was donated to the Inland Northwest Rail Museum at Reardan, WA in 2020. This unit was originally built for the Great Northern Railway as GN 598 and was incorporated in the formation of the Burlington Northern Railroad in 1970. It became part of BNSF after the merger of the Burlington Northern and Santa Fe Railroads in 1995. The same museum would later acquire former GN 599 from the City of Skykomish, Washington in early 2023 and will be cosmetically restored with its mechanical parts used for 598's restoration. [5]
• The Columbia Basin Railroad In Eastern Washington State owns 5 ex-BNSF and Montana Rail Link SD9s that are actively used in both road and switching service.
• The Escanaba and Lake Superior Railroad uses #1223, formerly of Reserve Mining, in regular service around Escanaba, Michigan; other SD9s owned by the railroad are as of 2016 in a "deadline" in Wells, Michigan.
• Colorado & Southern 839, later Burlington Northern 6234, was donated by successor Burlington Northern Santa Fe Corp. to the Minnesota Transportation Museum. It now operates on the museum's Osceola and St Croix Valley Railway. 6234 is an example of the last variation of SD9 locomotives produced, which used the SD18 carbody.
• The Nevada Northern Railway uses #204, ex-SP SD9E #4426 to occasionally to pull their passenger trains.
• Southern Pacific 4404 is preserved at WRIX/Western Rail INC.
• Milwaukee Road 532, rebuilt by the Milwaukee into an 'SD10', lives at the Whitewater Valley Railroad. It was originally their 2235.
• Nickel Plate Road 349 is preserved at the Mad River & Nickel Plate Railroad Museum. It was retired as Norfolk Southern #52, and was donated to the museum in December 2010. It has been restored to its Norfolk & Western appearance.
• Nickel Plate Road 358 is preserved at the Fort Wayne Railroad Historical Society. Undergoing full restoration into NKP appearance.
• The Portland and Western Railroad uses two SD9s for switching and industry service. PNWR 1852 operates out of their Albany, OR Burlington Northern yard and PNWR 1854 is assigned to the rock train, both Ex-SP Heritage. Both locomotives are scheduled to be scrapped by parent company GWI as part of a fine resolution agreement with the EPA.[6]
• The Oregon Coast Scenic Railroad has an ex-BN SD9 6139 in operating condition and is used as a backup locomomotive for its excursions.
• The Western Rail Inc. owns 3 SD9m (SD9 rebuild) units. 13, 50, & 1886. 13 & 50 are Ex-Norfolk Southern, Exx-Norfolk & Western, née Nickel Plate Road. 1886 is Ex-Norfolk Southern, Exx-Southern, née Central of Georgia.
• BNSF #1550 has been donated to the Lake Superior Railroad Museum.[7]
• An ex-Central of Georgia SD9, Black River & Western Railroad 9581, is currently on lease to Kinder-Morgan Newport News for yard duty.
• The Albany & Eastern Railroad (AERC) has 1 SD9E in Black Widow paint, AERC/LLW 5399, It is used for both Passenger and Freight service in Lebanon, OR.
• KORAIL 5025 is only preserved SD9 in Korea, plinthed in front of Daejeon MPD, along single G12 4102. Both engines worked for construction of KTX Gyeongbu section as departmental vehicles upon retirement of KORAIL.
• The Niles Canyon Railway owns one Ex-Southern Pacific SD9 #5472. It was built in 1956 and had a restoration to operational condition in 2005.

• EMD SD9E

• Pinkepank, Jerry A. (1973). The Second Diesel Spotter's Guide. Milwaukee, Wisconsin: Kalmbach Publishing. ISBN 978-0-89024-026-7.
• Sarberenyi, Robert. EMD SD9 Original Owners. Retrieved on August 27, 2006
• Komanesky, John. Preserved EMD Locomotives. Retrieved on May 18, 2009

• Media related to EMD SD9 locomotives at Wikimedia Commons