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Baltimore and Ohio No. 9624 TR4 cow-calf set at Riverside Yard, Baltimore, in 1969.  Photo by Roger Puta.

A preserved EMD SW7 locomotive at the Southeastern Railway Museum in Duluth, Georgia.

By Josh Hallett [CC BY-SA 2.0  (], via Wikimedia Commons

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EMD SW7 and TR4 Diesel-Electric Locomotives
The EMD SW7 was a diesel switcher locomotive built by General Motors Electro-Motive Division between October 1949 and January 1951. It was powered by a V12 567A engine developing 1,200 horsepower (895 kW). 489 SW7 locomotives were produced. The majority of the SW7s were built by EMD Plant No. 3 in Cleveland, Ohio. In addition, 15 TR4 cow-calf paired sets were produced.

Original buyers

Railroad: Arkansas and Louisiana Missouri Railway
Quantity: 1
Road numbers: 11

Railroad: Atlantic Coast Line Railroad
Quantity: 9
Road numbers: 643–651

Railroad: Central Railroad of New Jersey
Quantity: 4
Road numbers: 1080–1083

Railroad: Charleston and Western Carolina Railway
Quantity: 2
Road numbers: 800–801

Railroad: Chesapeake and Ohio Railway
Quantity: 26
Road numbers: 5214–5239

Railroad: Chicago and Eastern Illinois Railroad
Quantity: 6
Road numbers: 126–131

Railroad: Chicago and Eastern Illinois (Chicago Heights Terminal and Transfer Railroad)
Quantity: 2
Road numbers: 132–133

Railroad: Chicago and Illinois Western Railroad
Quantity: 3
Road numbers: 101–103

Railroad: Chicago, Burlington and Quincy Railroad
Quantity: 20
Road numbers: 9249–9268
Notes: to Burlington Northern 115-134

Railroad: Clinchfield Railroad
Quantity: 6
Road numbers: 350–355

Railroad: Colorado and Southern Railway
Quantity: 1
Road numbers: 154

Railroad: Conemaugh and Black Lick Railroad
Quantity: 15
Road numbers: 103–117

Railroad: Cornwall Railroad
Quantity: 3
Road numbers: 120–122

Railroad: Detroit and Toledo Shore Line Railroad
Quantity: 3
Road numbers: 116–118

Railroad: Detroit Terminal
Quantity: 1
Road numbers: 116

Railroad: Detroit, Toledo and Ironton Railroad
Quantity: 5
Road numbers: 920–924

Railroad: Erie Railroad
Quantity: 6
Road numbers: 428–433

Railroad: Great Northern Railway
Quantity: 11
Road numbers: 163–170, 11–13
to Burlington Northern 135-145

Railroad: Illinois Central Railroad
Quantity: 50
Road numbers: 9300–9319, 9400–9429

Railroad: Kansas City Southern Railway
Quantity: 10
Road numbers: 1300–1309

Railroad: Kansas City Southern Railway (Louisiana and Arkansas Railway)
Quantity: 6
Road numbers: 1310–1315

Railroad: Lakeside and Marblehead Railroad
Quantity: 1
Road numbers: 12

Railroad: Lehigh Valley Railroad
Quantity: 5
Road numbers: 220–224

Railroad: Louisiana Midland Railway
Quantity: 1
Road numbers: 10

Railroad: Louisville and Nashville Railroad
Quantity: 22
Road numbers: 2245–2266

Railroad: Maine Central Railroad
Quantity: 3
Road numbers: 331–333

Railroad: Milwaukee Road
Quantity: 1
Road numbers: 1646
Note: renumbered 623

Railroad: Missouri Pacific Railroad
Quantity: 5
Road numbers: 9142–9146

Railroad: Monessen Southwestern Railway
Quantity: 1
Road numbers: 21

Railroad: Montour Railroad
Quantity: 1
Road numbers: 72

Railroad: Nashville, Chattanooga and St. Louis Railway
Quantity: 10
Road numbers: 24–33

Railroad: New York Central Railroad
Quantity: 34
Road numbers: 8851–8855, 8880–8897, 8911–8921

Railroad: New York Central (Indiana Harbor Belt Railroad)
Quantity: 40
Road numbers: 8835–8850, 8856–8879

Railroad: New York Central (Chicago River and Indiana Railroad)
Quantity: 6
Road numbers: 8898–8903

Railroad: New York Central (Peoria and Eastern Railway)
Quantity: 7
Road numbers: 8904–8910

Railroad: New York, Chicago and St. Louis Railroad (“Nickel Plate Road”)
Quantity: 3
Road numbers: 230–232

Railroad: Northern Pacific Railway
Quantity: 8
Road numbers: 107–114
Notes: to Burlington Northern

Railroad: Pennsylvania Railroad
Quantity: 48
Road numbers: 8861–8868, 8871–8872, 9358–9395

Railroad: Peoria and Pekin Union Railway
Quantity: 5
Road numbers: 406–410

Railroad: Phelps Dodge Corporation (New Cornelia Branch Mine)
Quantity: 1
Road numbers: 6

Railroad: Philadelphia, Bethlehem and New England Railroad
Quantity: 4
Road numbers: 31–34

Railroad: River Terminal Railway
Quantity: 2
Road numbers: 61–62

Railroad: Southern Railway (Alabama Great Southern Railroad)
Quantity: 5
Road numbers: 6505–6509

Railroad: Southern Railway (Cincinnati, New Orleans and Texas Pacific Railway)
Quantity: 14
Road numbers: 6060–6073

Railroad: Southern Railway (Georgia Southern and Florida Railway)
Quantity: 4
Road numbers: 8200–8203

Railroad: Southern Railway (New Orleans and North Eastern Railway)
Quantity: 12
Road numbers: 6852–6863

Railroad: St. Louis Southwestern Railway (“Cotton Belt”)
Quantity: 4
Road numbers: 1054–1057
Note: renumbered 2200-2203

Railroad: St. Louis-San Francisco Railway (“Frisco”)
Quantity: 5
Road numbers: 300–304

Railroad: Texas and Pacific Railway
Quantity: 4
Road numbers: 1020–1023

Railroad: Union Pacific Railroad
Quantity: 25
Road numbers: 1800–1824

Railroad: Union Railroad
Quantity: 4
Road numbers: 571–574

Railroad: Wabash Railroad
Quantity: 8
Road numbers: 355–362

Railroad: Weyerhaueser Timber Company
Quantity: 2
Road numbers: 300–301

Railroad: Woodward Iron Company
Quantity: 2
Road numbers: 50–51
Note: Built with 567B engines

Railroad: Youngstown and Southern Railway
Quantity: 2
Road numbers: 70–71

Total Units: 489

Original Buyers
TR4 Cow and Calf Sets

Railroad: Atchison, Topeka and Santa Fe Railway
Quantity: 2 sets
Road numbers: 2418,A–2419,A

Railroad: Belt Railway of Chicago
Quantity: 5 sets
Road numbers: 502AB–506AB

Railroad: Chesapeake and Ohio Railway
Quantity: 2 sets
Road numbers: 6001AB–6002AB

Railroad: Milwaukee Road
Quantity: 6 sets
Road numbers: 2001AB–2006AB

Total Sets: 15

EMD SW7 Overview
Type and origin
Power type: Diesel-electric
Builder: General Motors Electro-Motive Division (EMD)
Model: SW7, TR4
Build date: October 1949 – January 1951
Total produced SW7: 489
TR4: 15 sets
Gauge: 4 ft 8 1⁄2 in (1,435 mm) standard gauge
Prime mover: EMD 567A
Engine type: V12 diesel
Aspiration: Roots-type supercharger
Cylinders: 12
Performance figures
Power output: 1,200 hp (895 kW)

See also:


EMD Diesel-Electric Locomotives

Diesel-Electric Locomotives


Baltimore and Ohio No. 9624 TR4 cow-calf set at Riverside Yard, Baltimore, in 1969. Photo by Roger Puta.