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EMD SD9 Diesel-Electric Locomotive
An SD9 is a 6-axle diesel locomotive built by General Motors Electro-Motive Division between January 1954 and June 1959. An EMD 567C 16-cylinderengine generated 1,750 horsepower (1.30 MW). This model is, externally, similar to its predecessor, the SD7, but this model, internally, features the improved and much more maintainable 567C engine. The principal spotting feature are 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. 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.

Four hundred and seventy-one SD9s were built for American railroads and 44 for export.

Original buyers

Electro-Motive Division (demonstrator)
Quantity: 1
Road number: 5591
Notes: to Duluth, Missabe and Iron Range 110.

Atlanta and St. Andrews Bay Railroad
Quantity: 3
Road numbers: 503–505

Baltimore and Ohio Railroad
Quantity: 10
Road numbers: 765–774

Chicago, Burlington and Quincy Railroad
Quantity: 80
Road numbers: 325–374, 430–459
Notes: 325–374 equipped with steam generators.

Colorado and Southern Railway
Quantity: 23
Road numbers: 820–842

Central of Georgia Railway
Quantity: 6
Road numbers: 202–207

Chicago and Illinois Midland Railroad
5
Quantity: 50–54

Chicago and North Western Railway
Quantity: 14
Road numbers: 1701–1710, 1721–1724
Notes: Fitted for Chicago commuter service.

Chicago, Milwaukee, St. Paul and Pacific Railroad
Quantity: 14
Road numbers: 2224–2237
Notes: Renumbered.

Chile Exploration (Chile)
Quantity: 5
Road numbers: 901–905
Notes: Track gauge 1,676 mm (5 ft 6 in) 

Duluth, Missabe and Iron Range Railroad
Quantity: 73
Road numbers: 101–109, 111–174
Notes: 129–130 equipped with steam generators.

Denver and Rio Grande Western Railroad
Quantity: 10
Road numbers: 5305–5314

Elgin, Joliet and Eastern Railway
Quantity: 3
Road numbers: 600–602

Great Northern Railway
Quantity: 27
Road numbers: 573–599

Korail (Korea)
Quantity: 29
Road numbers: 101–129
Notes: Later renumbered 5001-5029.

New York, Chicago and St. Louis Railroad (“Nickel Plate Road”)
Quantity: 20
Road numbers: 340–359

Orinoco Mining (Venezuela)
Quantity: 10
Road numbers: 1011–1020

Pennsylvania Railroad
Quantity: 25
Road numbers: 7600–7624

Reserve Mining
Quantity: 6
Road numbers: 1220–1225
Notes: To Escanaba and Lake Superior Railroad.

Soo Line (Wisconsin Central Railroad)
Quantity: 1
Road number: 2381

Southern Pacific Company
Quantity: 150
Road numbers: 5340–5444, 5449–5493
Notes: 5340–5391 equipped with steam generators.

Total Units: 515

Preservation
Several 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 uses SD9 506 and SD9E 4427 in revenue freight service.

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 an ex-SP SD9 occasionally to pull their passenger trains.

Southern Pacific 4404 is preserved at the Western Pacific Railroad Museum at Portola, California It has been sold, and is now awaiting pickup in the Union Pacific Portola yard. Southern Pacific 4450 was scrapped in August 2013.

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 No. 52, and was donated to the museum in December 2010. It has been restored to its Norfolk & Western appearance.
The Portland and Western Railroad uses three SD9s for switching and industry service. PNWR 1852 operates out of their Albany, OR yard.
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 still rosters several SD9's. 4 are known to have been rebuilt into SD9-3's, numbers 1550-1553, and have modern EMD cabs.
An ex-Central of Georgia SD9, Black River & Western Railroad 9581, is currently on lease to Kinder-Morgan Newport News for yard duty.

EMD SD9 Overview
Type and origin
Power type: Diesel-electric
Builder: General Motors Electro-Motive Division (EMD)
Model: SD9
Build date: January 1954 – June 1959
Total produced: 515
Specifications
Configuration:
​ • AAR C-C
Gauge: 4 ft 8 1⁄2 in (1,435 mm) standard gauge, Chile 1,676 mm (5 ft 6 in) 
Fuel capacity: 1,200 or 2,400 US gal (4,500 or 9,100 l; 1,000 or 2,000 imp gal)
Prime mover: EMD 567C
Engine type: V16 diesel
Cylinders: 16
Performance figures
Power output: 1,750 hp (1.30 MW)
Career
Disposition: Several rebuilt and still in service.

See also:

SP 4450

EMD Diesel-Electric Locomotives

Diesel-Electric Locomotives

Locomotives

GM Electro-Motive Division

Algers, Winslow and Western Railway SD9 No. 203.

By Nate Beal - originally posted to Flickr as AWW, CC BY 2.0, https://commons.wikimedia.org/w/index.php?curid=4618217

Algers, Winslow and Western Railway SD9 No. 203.
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