An EMD SD18 is a 6-axle diesel locomotive

Locomotive

A locomotive is a railway vehicle that provides the motive power for a train. The word originates from the Latin loco – "from a place", ablative of locus, "place" + Medieval Latin motivus, "causing motion", and is a shortened form of the term locomotive engine, first used in the early 19th...

 built by General Motors Electro-Motive Division between April 1960 and March 1963. Power was provided by an EMD 567D1 16-cylinder

Cylinder (engine)

A cylinder is the central working part of a reciprocating engine or pump, the space in which a piston travels. Multiple cylinders are commonly arranged side by side in a bank, or engine block, which is typically cast from aluminum or cast iron before receiving precision machine work...

 engine which generated 1800 horsepower

Horsepower

Horsepower is the name of several units of measurement of power. The most common definitions equal between 735.5 and 750 watts.Horsepower was originally defined to compare the output of steam engines with the power of draft horses in continuous operation. The unit was widely adopted to measure the...

 (1.3 MW).

54 examples of this locomotive model were built for American

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 railroads, and 60 for export, including 15 for Korail

Korail

Korea Railroad Corporation , promoted as Korail , is the national railroad operator in South Korea.Korail operates passenger and freight trains throughout South Korea...

 (Order#700735~700749, Serial#28373~28387).

Original Owners

Owner	Quantity	Numbers
Bessemer and Lake Erie Railroad Bessemer and Lake Erie Railroad The Bessemer and Lake Erie Railroad is a class II railroad that operates in northwestern Pennsylvania and northeastern Ohio.The railroad's main route runs from the Lake Erie port of Conneaut, Ohio to the Pittsburgh suburb of Penn Hills, Pennsylvania, a distance of 139 miles...	7	851-857
Chesapeake and Ohio Railway Chesapeake and Ohio Railway The Chesapeake and Ohio Railway was a Class I railroad formed in 1869 in Virginia from several smaller Virginia railroads begun in the 19th century. Led by industrialist Collis P...	19	1800-1818
Chicago and Illinois Midland Railway Chicago and Illinois Midland Railway The Illinois and Midland Railroad is a railroad in the U.S. state of Illinois, serving Peoria, Springfield and Taylorville. Until 1996, when Genesee & Wyoming Inc. bought it, the company was named the Chicago and Illinois Midland Railway...	2	60-61
Duluth, Missabe and Iron Range Railway Duluth, Missabe and Iron Range Railway The Duluth, Missabe and Iron Range Railway is a railroad operating in northern Minnesota and Wisconsin that hauls iron ore and later taconite to the Great Lakes ports of Duluth and Two Harbors, Minnesota...	19	175-193
Reserve Mining Co.	7	1226-1232
RFFSA RFFSA The Rede Ferroviária Federal, Sociedade Anônima was the state-owned national railway company of Brazil. It was created in 1957, and dissolved between 1999–2007.-Constituent Railways:...  (export to Brazil)	45	3401-3445
Korea National Railroad	15	6001-6015

Preservation

At least four SD18s have been preserved. Chop-nosed Duluth, Missabe & Iron Range

Duluth, Missabe and Iron Range Railway

The Duluth, Missabe and Iron Range Railway is a railroad operating in northern Minnesota and Wisconsin that hauls iron ore and later taconite to the Great Lakes ports of Duluth and Two Harbors, Minnesota...

 193 is now an operating member of the Lake Superior Railroad Museum

Lake Superior Railroad Museum

The Lake Superior Railroad Museum is a railroad museum in Duluth, Minnesota.The museum has seven steam, fourteen diesel and two electric locomotives, and over 40 other pieces of rolling stock...

 collection. They also have DM&IR 316 in their collection, which is an "SDM", an SD18 rebuilt by the DM&IR. However, it is still labeled as an SD18.

The South Branch Valley Railroad also regularly operates an ex-Bessemer & Lake Erie SD18 #853 as their #182.

A fourth unit is former Chesapeake and Ohio, in Chessie paint, at the Hoosier Valley Railroad Museum

Hoosier Valley Railroad Museum

The Hoosier Valley Railroad Museum is a railroad museum located at 507 Mulberry Street in North Judson, Indiana.The non-profit museum is located at a former Erie Railroad facility. The museum is open Saturdays all year with train rides also available from May to October...

in North Judson, Indiana. It wears road number 7311 and is sub-lettered Indiana Boxcar Company, IBEX. It is used on from time to time at the museum as well as on the Chesapeake and Indiana Shortline.