View source for EMD SW7

{{Short description|Model of 1200 hp American diesel switcher}}
{{Infobox locomotive
| name=EMD SW7
| image=Baltimore and Ohio 9624 (TR4) Cow and Calf at Riverside Yard, Baltimore (22341847029).jpg
| caption=Baltimore and Ohio {{Abbr|No.|Number}} 9624 TR4 cow–calf set at Riverside Yard, Baltimore, in 1969
| powertype=Diesel–electric
| gauge={{track gauge|ussg|allk=on}}
| builder=[[Electro-Motive Diesel|General Motors Electro-Motive Division]] (EMD)
| builddate=October 1949 &ndash; January 1951
| buildmodel=SW7, TR4
| aarwheels=B-B
| uicclass=Bo′Bo′
| cylindercount=12
| primemover=[[Electro-Motive Diesel|EMD]] [[EMD 567|12-567B]]A<ref name="Solomon261"/>
| enginetype= [[V12 engine|V12]]  [[Two-stroke diesel engine|diesel]]
| aspiration=[[Roots-type blower]]
| poweroutput= {{convert|1200|hp|abbr=on|sigfig=3}}
| totalproduction=SW7: 489<br>TR4: 30
}}
The '''EMD SW7''' was a [[diesel locomotive|diesel]] [[switcher locomotive]] built by [[Electro-Motive Diesel|General Motors Electro-Motive Division]] between October 1949 and January 1951.<ref name=":0">{{Cite book|last=Schafer|first=Mike|url=https://www.worldcat.org/oclc/38738930|title=Vintage diesel locomotives|date=1998|publisher=Motorbooks International|isbn=0-7603-0507-2|location=Osceola, WI|pages=25|oclc=38738930}}</ref> It was powered by a {{convert|1200|hp|lk=on|sigfig=3}}[[EMD 567|12-567A engine]].<ref name="Solomon261">{{Cite book|last=Solomon|first=Brian|url=https://books.google.com/books?id=JubUBAAAQBAJ&dq=SW7+EMD+567A&pg=PA231|title=GE and EMD Locomotives: The Illustrated History|date=August 2014|publisher=Voyageur Press|isbn=978-0-7603-4612-9|pages=231|language=en}}</ref> The SW7 replaced the earlier 1,000 horsepower [[EMD NW2|NW2 switcher]] in EMD's catalog.<ref name=":1">{{Cite book|last=Marre|first=Louis A.|url=https://www.worldcat.org/oclc/34531120|title=Diesel locomotives : the first 50 years : a guide to diesels built before 1972|date=1995|publisher=Kalmbach Pub. Co|isbn=0-89024-258-5|location=Waukesha, WI|pages=30–31|oclc=34531120}}</ref> A total of 489 SW7 locomotives were produced. The majority of the SW7s were built by EMD Plant #3 in Cleveland, Ohio.{{Citation needed|date=August 2021}} In addition, 30 '''TR4''' [[cow–calf]] paired sets were produced.<ref name=":1" />

SW7 production was discontinued in 1951 in favor of the new [[EMD SW9|SW9]].<ref name=":0" />

== Original buyers ==
{|class="wikitable"
! Railroad !! Quantity !! Road numbers
|-
|[[Arkansas and Louisiana Missouri Railway]] ||style="text-align:center;" |1 ||style="text-align:center;" |11 
|-
|[[Atlantic Coast Line Railroad]] ||style="text-align:center;" |9 ||style="text-align:center;" |643–651 
|-
|[[Central Railroad of New Jersey]] ||style="text-align:center;" |4 ||style="text-align:center;" |1080–1083 
|-
|[[Charleston and Western Carolina Railway]] ||style="text-align:center;" |2 ||style="text-align:center;" |800–801 
|-
|[[Chesapeake and Ohio Railway]] ||style="text-align:center;" |26 ||style="text-align:center;" |5214–5239 
|-
|[[Chicago and Eastern Illinois Railroad]] ||style="text-align:center;" |6 ||style="text-align:center;" |126–131 
|-
|Chicago and Eastern Illinois ([[Chicago Heights Terminal and Transfer Railroad]]) ||style="text-align:center;" |2 ||style="text-align:center;" |132–133 
|-
|[[Chicago and Illinois Western Railroad]] ||style="text-align:center;" |3 ||style="text-align:center;" |101–103 
|-
|[[Chicago, Burlington and Quincy Railroad]] ||style="text-align:center;" |20 ||style="text-align:center;" |9249–9268 
|-
|[[Chicago, Milwaukee, St. Paul and Pacific Railroad]] ||style="text-align:center;" |1 ||style="text-align:center;" |1646 
|-
|[[Clinchfield Railroad]] ||style="text-align:center;" |6 ||style="text-align:center;" |350–355 
|-
|[[Colorado and Southern Railway]] ||style="text-align:center;" |1 ||style="text-align:center;" |154 
|-
|[[Conemaugh and Black Lick Railroad]] ||style="text-align:center;" |15 ||style="text-align:center;" |103–117 
|-
|[[Cornwall Railroad]] ||style="text-align:center;" |3 ||style="text-align:center;" |120–122 
|-
|[[Detroit and Toledo Shore Line Railroad]] ||style="text-align:center;" |3 ||style="text-align:center;" |116–118 
|-
|[[Detroit Terminal Railroad]]||style="text-align:center;" |1 ||style="text-align:center;" |116 
|-
|[[Detroit, Toledo and Ironton Railroad]] ||style="text-align:center;" |5 ||style="text-align:center;" |920–924 
|-
|[[Erie Railroad]] ||style="text-align:center;" |6 ||style="text-align:center;" |428–433 
|-
|[[Great Northern Railway (US)|Great Northern Railway]] ||style="text-align:center;" |11 ||style="text-align:center;" |163–170, 11–13 
|-
|[[Illinois Central Railroad]] ||style="text-align:center;" |50 ||style="text-align:center;" |9300–9319, 9400–9429 
|-
|[[Kansas City Southern Railway]] ||style="text-align:center;" |10 ||style="text-align:center;" |1300–1309 
|-
|Kansas City Southern Railway ([[Louisiana and Arkansas Railway]]) ||style="text-align:center;" |6 ||style="text-align:center;" |1310–1315 
|-
|[[Lakeside and Marblehead Railroad]] ||style="text-align:center;" |1 ||style="text-align:center;" |12 
|-
|[[Lehigh Valley Railroad]] ||style="text-align:center;" |5 ||style="text-align:center;" |220–224 
|-
|[[Louisiana Midland Railway]] ||style="text-align:center;" |1 ||style="text-align:center;" |10 
|-
|[[Louisville and Nashville Railroad]] ||style="text-align:center;" |22 ||style="text-align:center;" |2245–2266 
|-
|[[Maine Central Railroad]] ||style="text-align:center;" |3 ||style="text-align:center;" |331–333 
|-
|[[Missouri Pacific Railroad]] ||style="text-align:center;" |5 ||style="text-align:center;" |9142–9146 
|-
|[[Monessen Southwestern Railway]] ||style="text-align:center;" |1 ||style="text-align:center;" |21 
|-
|[[Montour Railroad]] ||style="text-align:center;" |1 ||style="text-align:center;" |72 
|-
|[[Nashville, Chattanooga and St. Louis Railway]] ||style="text-align:center;" |10 ||style="text-align:center;" |24–33 
|-
|[[New York Central Railroad]] ||style="text-align:center;" |34 ||style="text-align:center;" |8851–8855, 8880–8897, 8911–8921 
|-
|New York Central ([[Indiana Harbor Belt Railroad]]) ||style="text-align:center;" |40 ||style="text-align:center;" |8835–8850, 8856–8879 
|-
|New York Central ([[Chicago River and Indiana Railroad]]) ||style="text-align:center;" |6 ||style="text-align:center;" |8898–8903 
|-
|New York Central ([[Peoria and Eastern Railway]]) ||style="text-align:center;" |7 ||style="text-align:center;" |8904–8910 
|-
|[[New York, Chicago and St. Louis Railroad]] (“Nickel Plate Road”) ||style="text-align:center;" |3 ||style="text-align:center;" |230–232 
|-
|[[Northern Pacific Railway]] ||style="text-align:center;" |8 ||style="text-align:center;" |107–114 
|-
|[[Pennsylvania Railroad]] ||style="text-align:center;" |48 ||style="text-align:center;" |8861–8868, 8871–8872, 9358–9395 
|-
|[[Peoria and Pekin Union Railway]] ||style="text-align:center;" |5 ||style="text-align:center;" |406–410 
|-
|[[Phelps Dodge Corporation]] (New Cornelia Branch Mine) ||style="text-align:center;" |1 ||style="text-align:center;" |6 
|-
|[[Philadelphia, Bethlehem and New England Railroad]] ||style="text-align:center;" |4 ||style="text-align:center;" |31–34 
|-
|[[River Terminal Railway]] ||style="text-align:center;" |2 ||style="text-align:center;" |61–62 
|-
|[[Southern Railway (U.S.)|Southern Railway]] ([[Alabama Great Southern Railroad]]) ||style="text-align:center;" |5 ||style="text-align:center;" |6505–6509 
|-
|Southern Railway ([[Cincinnati, New Orleans and Texas Pacific Railway]]) ||style="text-align:center;" |14 ||style="text-align:center;" |6060–6073 
|-
|Southern Railway ([[Georgia Southern and Florida Railway]]) ||style="text-align:center;" |4 ||style="text-align:center;" |8200–8203 
|-
|Southern Railway ([[New Orleans and North Eastern Railway]]) ||style="text-align:center;" |12 ||style="text-align:center;" |6852–6863 
|-
|[[St. Louis Southwestern Railway]] (“Cotton Belt”) ||style="text-align:center;" |4 ||style="text-align:center;" |1054–1057 
|-
|[[St. Louis-San Francisco Railway]] (“Frisco”) ||style="text-align:center;" |5 ||style="text-align:center;" |300–304 
|-
|[[Texas and Pacific Railway]] ||style="text-align:center;" |4 ||style="text-align:center;" |1020–1023 
|-
|[[Union Pacific Railroad]] ||style="text-align:center;" |25 ||style="text-align:center;" |1800–1824 
|-
|[[Union Railroad (Pittsburgh, Pennsylvania)|Union Railroad]] ||style="text-align:center;" |4 ||style="text-align:center;" |571–574 
|-
|[[Wabash Railroad]] ||style="text-align:center;" |8 ||style="text-align:center;" |355–362 
|-
|[[Weyerhaeuser|Weyerhaueser Timber Company]]||style="text-align:center;" |2 ||style="text-align:center;" |300–301 
|-
|[[Woodward Iron Company]] ||style="text-align:center;" |2 ||style="text-align:center;" |50–51 
|-
|[[Youngstown and Southern Railway]] ||style="text-align:center;" |2 ||style="text-align:center;" |70–71 
|-
!Total !! 489 !! 
|}

=== TR4 ===
{|class="wikitable"
!Railroad !! Quantity [[A unit]]s !! Quantity [[B unit]]s !! Road numbers A units !! Road numbers B units!! Notes
|-
|[[Atchison, Topeka and Santa Fe Railway]] ||style="text-align:center;" |2 ||style="text-align:center;" |2 ||style="text-align:center;" |2418L–2419L ||style="text-align:center;" |2418A–2419A ||
|-
|[[Belt Railway of Chicago]] ||style="text-align:center;" |5 ||style="text-align:center;" |5 ||style="text-align:center;" |502A–506A ||style="text-align:center;" |502B–506B ||
|-
|[[Chesapeake and Ohio Railway]] ||style="text-align:center;" |2 ||style="text-align:center;" |2 ||style="text-align:center;" |6001A–6002A ||style="text-align:center;" |6001B–6002B ||
|-
|[[Chicago, Milwaukee, St. Paul and Pacific Railroad]] ||style="text-align:center;" |6 ||style="text-align:center;" |6 ||style="text-align:center;" |2001A–2006A ||style="text-align:center;" |2001B–2006B || 
|-
!Total !! 15 !! 15 !! !! !!
|-
|}

== External links ==
*{{commons category-inline|EMD SW7 locomotives}}

== See also ==
* [[List of GM-EMD locomotives]]

== References ==
<references />
* * Kristopans, Andre J. http://utahrails.net/ajkristopans/SWITCHERS201Aand567.php Retrieved October 7, 2014.This is a compilation of EMD Product Reference Data{{Unreliable source?|date=July 2020}}
* General Motors Electro-Motive Division Service Department "Locomotive Reference Data" published January 1, 1959, 286 pages.
{{Diesel_Switchers}}

[[Category:B-B locomotives]]
[[Category:Electro-Motive Division locomotives|SW0007]]
[[Category:Diesel–electric locomotives of the United States]]
[[Category:Railway locomotives introduced in 1949]]
[[Category:Locomotives with cabless variants]]
[[Category:Standard-gauge locomotives of the United States]]
[[Category:Shunting locomotives]]
[[Category:Baltimore and Ohio locomotives]]
[[Category:Chesapeake and Ohio locomotives]]
[[Category:Chicago, Burlington and Quincy locomotives]]
[[Category:Erie Railroad locomotives]]
[[Category:Great Northern Railway (United States) locomotives]]
[[Category:Illinois Central locomotives]]
[[Category:Maine Central Railroad locomotives]]
[[Category:Milwaukee Road locomotives]]
[[Category:New York Central Railroad locomotives]]
[[Category:Nickel Plate Road locomotives]]
[[Category:Northern Pacific Railway locomotives]]
[[Category:Pennsylvania Railroad locomotives]]
[[Category:Diesel locomotives of Southern Railway (U.S.)]]
[[Category:St. Louis–San Francisco Railway locomotives]]
[[Category:Union Pacific Railroad locomotives]]



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