EMD SW1 Diesel-Electric Locomotive
The EMD SW1 is a 600-horsepower (450 kW) diesel-electric switcher locomotive built by General Motors' Electro-Motive Corporation (later Division) between December 1938 and November 1953. Final assembly was at EMD's plant at LaGrange (McCook) Illinois. The SW1 was the second generation of 3,402 cu in (55.75 L) switcher from EMD, succeeding the SC (cast frame) and SW (welded frame). The most significant change from those earlier models was the use of an engine of EMD's own design, the then-new 567 engine, here in 600 hp (450 kW) V6 form. 661 locomotives of this design were built, not withstanding diesel switcher production having been suspended between 1942 and 1945 by the War Production Board, as the 567 engines were needed elsewhere, mainly for U.S. Navy LST vessels.

Engine and powertrain
The SW1 introduced a 6-cylinder version of the 567 (later 567A) series engine to EMC/EMD switchers. Developing 600-horsepower (450 kW) at 800 rpm., this engine remained in production until 1966. Designed specifically for railroad locomotives, this was a supercharged 2 stroke 45 degree V type, with an 8 1⁄2 by 10 in (216 by 254 mm), bore by stroke, giving 567 cubic inches (9.29 L) displacement per cylinder. A D.C. generator provides power to four motors, two on each truck, in a B-B arrangement. The SW1, like most EMD switchers, use the AAR Type A switcher truck. EMC/ EMD has built all its own components since 1939.

Production changes
Like most long-running locomotive models, a number of changes were made to the SW1 over its production life. Internally, the post-1945 locomotives were somewhat improved, and used an updated 567A engine.

One easily spotted change is the shape of the two center cab windows over the hood, which were curved to follow the roofline originally, but became flat-topped after mid-1950. Another easily seen is the taper of the hood to the cab, which was a two-stage taper in earlier units but became a single taper in later production. Very early locomotives were delivered with a stubby exhaust stack, but this did not lift the diesel exhaust sufficiently clear of crew visibility. All later units were delivered with EMD's standard conical switcher stack, while early units were generally modified with taller stacks too. Early locomotives had a single large headlight, while later had twin sealed-beam headlights.

Identification
The SW1 appears very similar to its SC and SW predecessors, but has only a single stack instead of two, a significantly shorter hood and a larger rear platform, no small louvers on the front top hood sides, and a large grille instead of lifting vents on top of the hood front. The sandbox in front of the radiator is somewhat smaller on the SW1.

Compared to later EMD switchers, the SW1 has a much shorter hood, large platforms at each end, a single exhaust stack, and a large 'satchel' type sandbox.

Original owners

Allegheny and South Side Railway
Quantity:   1
Road number:   101

Allis-Chalmers
Quantity:   1
Road number:   8

Angelina and Neches River Railroad
Quantity:   1
Road number:   10

Atlantic and East Carolina Railway
Quantity:   1
Road number:   9

Atlantic Coast Line Railroad
Quantity:   1
Road number:   1901
Remarks:   Rejected, to Richmond Terminal Railroad No. 1

Baltimore and Ohio Railroad
Quantity:   22
Road numbers:   200–221
Remarks:   No. 208, B&O renumbered to No. 8408, is currently owned by Wilmington & Western Railroad. 2nd oldest SW1 in routine scheduled service.

Ballard Terminal Railroad
Quantity:   1
Road number:   98

Boston and Maine Railroad
Quantity:   24
Road numbers:   1109–1132
Remarks:   1109 owned by RMNE. Thomaston, CT.

Broward County Port Authority
Quantity:   1
Road number:   400

Buffalo Creek Railroad
Quantity:   1
Road number:   42

Canton Railroad
Quantity:   5
Road numbers:   21–25

Central Indiana Railroad
Quantity:   1
Road number:   1

Central of Georgia Railroad
Quantity:   3
Road numbers:   2, 3, 7

Central of New Jersey
Quantity:   4
Road numbers:   1109–1112

Chattanooga Traction Company
Quantity:   1
Road number:   4

Chicago and Eastern Illinois Railroad
Quantity:   5
Road numbers:   95–99
Remarks:   99 to MP 6001, now Dardanelle & Russellville 16.

Chicago and North Western Railway
Quantity:   20
Road numbers:   1207–1212, 1214, 1215, 1268–1270, 1272–1278, 1271, 1279

Chicago District Electric Generating
Quantity:   2
Road numbers:   3, 4

Chicago Short Line Railway
Quantity:   2
Road numbers:   200–201

Chicago, Burlington and Quincy Railroad
Quantity:   20
Road numbers:   9136–9153

Chicago, Indianapolis and Louisville Railroad
Quantity:   3
Road numbers:   DS-50, 5, 6
Remarks:   DS-50 renumbered to 1.

Chicago, St. Paul, Minneapolis and Omaha Railway
Quantity:   1
Road number:   55

Chihuahua Forests
Quantity:   1
Road number:   500
Remarks:   only unit exported.

Cleveland Quarries
Quantity:   1
Road number:   2

Commonwealth Edison
Quantity:   6
Road numbers:   10–15

Conemaugh and Black Lick Railroad
Quantity:   6
Road numbers:   60–65

Delaware, Lackawanna and Western Railroad
Quantity:   11
Road numbers:   427–437

Detroit Edison
Quantity:   3
Road numbers:   210–212

Detroit, Toledo and Ironton Railroad
Quantity:   2
Road numbers:   900–901
Remarks:   re-powered with 8-567B 800 hp engines, new hoods 1952. Reclassified SW8.

Donner-Hanna Coke
Quantity:   1
Road number:   1

Elgin, Joliet and Eastern Railroad
Quantity:   27
Road numbers:   220–246

EMD Demonstrator Units
Quantity:   7
Road numbers:   755, 804, 905, 906, 911, 700, 152
Remarks: EMC 755 was the first SW1. There were 7 units built as EMD demonstrators: No. 152 (to Scullin Steel No. 6), 700 (to Manufacturers' Junction Railway No. 7), 755 (to Inland Steel No. 51), 804 (to Southern Pacific Railroad No. 1000, pictured above), 905 (to Central of Georgia No. 1), 906 (to Western Pacific Railroad No. 501), 911 (to Great Lakes Steel No. 11).

Erie Railroad
Quantity:   1
Road number:   360

Fort Worth and Denver Railway
Quantity:   2
Road numbers:   602, 604

Fort Worth Belt
Quantity:   1
Road number:   1

Galveston Wharves
Quantity:   5
Road numbers:   201–205
Remarks:   201 to Dardanelle & Russellville 15.

Garden City Western Railway
Quantity:   1
Road number:   201

Georgia and Florida Railroad
Quantity:   3
Road numbers:   70–72

Georgia Marble Company
Quantity:   1
Road number:   1

Granite City Steel
Quantity:   2
Road numbers:   600–601

Great Lakes Steel
Quantity:   14
Road numbers:   12, 14–18, 22, 30, 31, 33–36, 38

Great Northern Railway
Quantity:   9
Road numbers:   5101–5105, 80–83
Remarks:   5101–5105 renumbered.

Great Western Railway of Colorado
Quantity:   2
Road numbers:   61, 62

Hanna Furnace Company
Quantity:   3
Road numbers:   14–16

Houston Belt and Terminal Railway
Quantity:   1
Road number:   10

Illinois Central Railroad
Quantity:   19
Road numbers:   9014–9032

Inland Steel Company
Quantity:   12
Road numbers:   54, 57, 70–73, 76–81

Lehigh Portland Cement Company
Quantity:   1
Road number:   5

Lehigh Valley Railroad
Quantity:   6
Road numbers:   112–119
Remarks:   No. 114 is currently owned by Wilmington & Western Railroad. Oldest SW1 in routine scheduled service.

Louisiana Midland Railway
Quantity:   1
Road number:   11

Louisville and Nashville Railroad
Quantity:   5
Road numbers:   11–15

Manufacturers' Junction Railway
Quantity:   1
Road number:   6

Maryland and Pennsylvania Railroad
Quantity:   1
Road number:   70

Mathieson Chemical
Quantity:   2
Road numbers:   1–2

McLouth Steel
Quantity:   3
Road numbers:   3–5

Memphis Union Station
Quantity:   1
Road number:   10

Metropolitan Sanitary District of Greater Chicago
Quantity:   3
Road numbers:   1–3

Milwaukee Road
Quantity:   25
Road numbers:   1610–1634
Remarks:   renumbered.

Missouri Pacific Railroad
Quantity:   10
Road numbers:   9004–9006, 9011, 9200–9205

Nashville, Chattanooga and St. Louis Railway
Quantity:   1
Road number:   15

New York Central Railroad
Quantity:   81
Road numbers:   600–621 (first), 622–654, 580–599, 600–621 (second)

Nickel Plate Road
Quantity:   2
Road numbers:   105–106

Pennsylvania Railroad
Quantity:   85
Road numbers:   5910, 5944–5953, 5987–5999, 9104, 9137–9154, 9200–9203, 9205-9209, 9396–9428

Pere Marquette Railroad
Quantity:   2
Road numbers:   10–11

Phelps Dodge Corporation
Quantity:   1
Road number:   A

Philadelphia, Bethlehem and New England Railroad
Quantity:   9
Road numbers:   212–218, 220, 221

Public Service Company of Northern Illinois
Quantity:   3
Road numbers:   9–11

Portland Traction Company (Oregon)
Quantity:   2
Road numbers:   100, 200

Reading Railroad
Quantity:   9
Road numbers:   16–23

Republic Steel
Quantity:   22
Road numbers:   50–54, 300–306, 340–341, 352, 370–372, 890–891, 893–894

Chicago, Rock Island and Pacific Railroad
Quantity:   18
Road numbers:   529–546

Roscoe, Snyder and Pacific Railway
Quantity:   1
Road number:   100

Sahara Coal Company
Quantity:   2
Non-numbered

Seaboard Air Line Railroad
Quantity:   1
Road number:   1200

Soo Line Railroad
Quantity:   1
Road number:   320

Southern Railway
Quantity:   9
Road numbers:   2002–2004, 2007–2011, 8565

Southern Pacific Railroad
Quantity:   14
Road numbers:   1000, 1004–1016

Remarks:   No. 1000 former EMD Demonstrator No. 804.

St. Joseph Belt Railroad
Quantity:   1
Road number:   11

St. Joseph Terminal Railroad
Quantity:   2
Road numbers:   1–2

St. Louis – San Francisco Railway
Quantity:   1
Road number:   10

Tennessee Coal and Iron Railroad
Quantity:   4
Road numbers:   1000–1003

Terminal Railroad Association of St Louis
Quantity:   8
Road numbers:   501–508

Union Railroad
Quantity:   22
Road numbers:   455–476

US Department of Defense (US Army)
Quantity:   4
Road numbers:   7001–7004

Wabash Railroad
Quantity:   11
Road numbers:   101–111

Warner Sand and Gravel Company
Quantity:   1
Road number:   15

Western Pacific Railroad
Quantity:   2
Road numbers:   502–503
Remarks:   WP 501 was ex-EMC 906.

Wheeling Steel Company
Quantity:   4
Road numbers:   1001–1004

North Western Railway of Mexico
Quantity:   1
Road number:   500

As of 2013, Amtrak still had one SW1 on their roster. No. 737 is used for switching chores at the Wilmington Delaware shops

Preservation
The first SW1 built by EMC in 1939 is now preserved at the California State Railroad Museum in Sacramento, California. The locomotive worked for Holly Sugar in Santa Ana and Tracy as the company's number 1. The museum donation was a coordinated effort between the museum, the Pacific Coast Chapter of the Railway and Locomotive Historical Society and Spreckels Sugar (the locomotive's last owner).

EMC demonstrator 906, sold to the Western Pacific Railroad as their 501, is preserved at the Western Pacific Railroad Museum at Portola, CA. It has been restored back to its original WP image. This locomotive was the Western Pacific's first diesel-electric engine.

Another former Western Pacific SW1 is also preserved at the California State Railroad Museum. Later sold to WP subsidiary Sacramento Northern, this engine is preserved as SN 402, painted in the famous silver and orange "Zephyr" colors that the WP roads used through the 1950s and 1960s.

The Zanesville & Western Scenic Railroad Operates a preserved SW1 on its scenic line in Fultonham, Ohio.
The Wilmington and Western Railroad owns and operates two SW1s in tourist passenger service. One is from the Baltimore and Ohio, and the other is from the Lehigh Valley.

The Baltimore & Ohio Railroad Museum, Baltimore, MD has former SW1 Pere Marquette Railway #11 in operating condition at last report.

The Milwaukee Road Heritage Center operates a Black (Soon to be Painted into MILW Road's paint scheme) SW1 that was former NSP Northern States Power X-5, Ex-Burlington Northern 79, Exx- Chicago Burlington & Quincy 9137. Built in June 1939, the locomotive is in running condition, with its original Electro-Motive Division 6-567B-1 Prime Mover.

The Indiana Transportation Museum owns two SW1's, Monon Railroad #50 the first diesel locomotive to run on the Monon, Operating, & ITMZ No. 860 currently waiting for restoration (ex-Cenex Harvest States Cooperative #860, exx-Milwaukee Road No. 867).

The Illinois Railway Museum has former Commonwealth Edison SW1 No. 15. This unit is in operating condition and is one of the most frequently used diesels on the property.

The Minnesota Transportation Museum operates Andersen Windowalls 3110, which was donated by the Andersen Corporation in 2001. It was previously Norfolk and Western Railway 3110 and originally Wabash Railroad 110, built in June 1949.

Metra commuter rail inherited two SW1s from the Rock Island. The two engines are used for Yard Service and power on work trains on the Metra Electric and Rock Island lines. Built in 1939 and 1945, they are rumored to be two of the oldest operating diesels in Illinois.

FirstLight Power Resources actively operates a yellow SW1 with road number 1849 as a coal train yard switcher at the Mt. Tom Power Plant in Holyoke, Massachusetts This is ex Boston & Maine No. 1113.

Sahara Coal SW1 No. 6 was purchased in the 1990s by the Crab Orchard and Egyptian Railroad in Marion, Illinois and is still in operation.

Southern Pacific No. 1006 is at the Orange Empire Railway Museum.

Peabody Coal Company No. 470 (Former Delaware, Lackawanna and Western No. 436) is on static display at the Museum of the Coal Industry in Lynnville, Indiana.

EMC/EMD SW1 Overview
Type and origin
Power type: Diesel-electric
Builder: General Motors Electro-Motive Corp (later Division) (EMC/EMD)
Model: SW1
Build date: December 1938 – November 1953
Total produced: 661
Specifications
Configuration:
​ • AAR B-B
Gauge: 4 ft 8 1⁄2 in (1,435 mm) standard gauge
Trucks: AAR type A and BBA TYPE B
Wheel diameter: 40 in (1,016 mm)
Minimum curve: 57° (104.79 ft or 31.94 m)
Wheelbase: 30 ft (9.14 m)
Length: 44 ft 11 1⁄4 in (13.70 m)
Width: 10 ft (3.05 m)
Height: 14 ft 4 5⁄8 in (4.38 m)
Locomotive weight: 196,000 lb (89,000 kg)
Prime mover: EMD 567 or 567A or 567B
Engine type: V6 Two stroke diesel
Aspiration: Roots-type blower
Displacement: 3,402 cu in (55.75 L)
Generator: GM D-4
Traction motors: (4) GM D-7A
Cylinders: 6
Cylinder size: 8 1⁄2 in × 10 in (216 mm × 254 mm)
Performance figures
Power output: 600 hp (447 kW)
Tractive effort: 49,000 lb (22,000 kg)
Career
Locale: United States, Mexico

See also:

EMD Diesel Locomotives

EMD

Diesel Locomotives

Southern Pacific SW1 No. 1000 in March of 1967. This unit was SP's first wholly-owned diesel locomotive.   Photo by John A. Kirchner.

An SW1 Slideshow.

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Southern Pacific SW1 No. 1000 in March of 1967. This unit was SP's first wholly-owned diesel locomotive. Photo by John A. Kirchner.
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