1. Design

2. Original Owners

3. Derivatives and Experimental

4. SD40 Rebuilds
     SD40-Series Production Timeline  

5. Preservation

6. See also

7. References

The EMD SD40 is a 6-axle road switcher diesel-electric locomotive built by General Motors Electro-Motive Division between January 1966 and August 1972.

Design

Like its predecessor in EMD's catalog, the SD35, the SD40 is a high-horsepower, six-axle freight locomotive.

In 1966, EMD updated its locomotive catalog with entirely new models, all powered by the new 645 diesel engine. These included six-axle models SD38, SD40, SDP40 and SD45. All shared standardized components, including the frame, cab, generator, trucks, traction motors, and air brakes. The primary difference was the power output: SD38 = {{convert|2000|hp|abbr=on|lk=in|sigfig=3}} from a non-turbocharged V16, SD40 = {{convert|3000|hp|abbr=on|lk=in|sigfig=3}} from a turbocharged V16, and SD45 = {{convert|3600|hp|abbr=on|lk=in|sigfig=3}} from a turbocharged V20.

Original Owners

856 examples of this locomotive model were built for American railroads, 330 were built for Canadian railroads, 72 were built for Mexican railroads, 6 were built for the Guinea-Boke Project, and 4 SD40Ms riding on {{track gauge|5ft3in}} gauge trucks were exported to Brazil.

Built by EMD at McCook, Illinois

Built by GMD at London, Ontario

Mexican SD40's Built by EMD at McCook, Illinois or GMD at London, Ontario

Phases are as listed by Robert Sarberenyi. {{Citation needed|date=March 2013}}

Derivatives and Experimental

The very first test bed SD40, EMD 434, constructed on an SD35 frame in July 1964 was in active service until retired by Canadian National Railway in March 2009 and donated to the Monticello Railway Museum in July 2009, albeit having been upgraded to an "SD40-2R", as Illinois Central 6071.

18 customized SD40s were built for the Illinois Central Railroad as model SD40A, using the longer SDP45 frame, which allowed for a larger 5000 gallon fuel tank.

Versions of the SD40 modified for the Australian loading gauge were sold to WAGR and Victorian Railways as their L and C classes respectively.

The SD40 was succeeded by an upgraded Dash 2 version called the SD40-2.

SD40 Rebuilds

After having been succeeded by the more modern SD40-2, a large proportion of SD40 have been upgraded with more modern equipments. The main difference between rebuilt SD40 and genuine SD40-2 is that the latter uses a longer frame and has longer front and rear porches while the rebuilt SD40 have a shorter frame

A common product of rebuilding SD40s, and sometimes SD40-2s, is an SD40-3. The major addition denotes that the rebuilt unit or units as an SD40-3 is the addition of a micro-processor, and sometimes other modern components. The usual reasons for installing a micro-processor are improved traction control, and better fuel economy (via better injection control). Also, electronic control over braking systems (independent and automatic). This may include some SD39, SD45 and SD45-2 rebuilt to SD40-2 standards.

The SD40R is a rebuilt of all the Southern Pacific's SD40 between 1980 and 1981.^[1]

30 SD40 units have been rebuilt as SD40M-2 by Morrison Knudsen for Southern Pacific, alongside 97 SD45s and 6 SDP45s.^[2]

The SD40-2XR designates 15 SD40 and a SDP40 rebuilt to Dash-2 standards for Montana Rail Link.^[3]{{Better source|date=May 2018}}^[4]

The SD40E is an SD50 rebuilt by the Norfolk Southern Railway and derated to 3000 HP (equivalent to an SD40-2).

SD40-Series Production Timeline

         id:line     value:black         id:bg       value:white

  bar:1  color:powderblue from:01/01/1966 till:08/31/1972 text:SD40 (Jan 1966 - Aug 1972, 1,268 units produced)  bar:2  color:powderblue from:06/01/1966 till:05/31/1970 text:SDP40 (June 1966 - May 1970, 20 units produced)  bar:3  color:powderblue from:01/01/1969 till:01/01/1970 text:SD40A (1969 - 1970, 18 units produced)  bar:4  color:powderblue from:01/01/1972 till:10/31/1989 text:SD40-2 (Jan 1972 - Oct 1989, 3,957 units produced)  bar:5  color:powderblue from:06/01/1973 till:08/31/1974 text:SDP40F (June 1973 - Aug 1974, 150 units produced)  bar:6  color:powderblue from:04/01/1974 till:07/31/1980 text:SD40T-2 (Apr 1974 - July 1980, 312 units produced)    bar:7  color:powderblue from:05/01/1975 till:12/31/1980 text:SD40-2W (May 1975 - Dec 1980, 123 units produced)  bar:8  color:powderblue from:04/01/1978 till:05/30/1978 text:SD40-2S (Apr 1978 - May 1978, 5 units produced; Nov 1980, 4 units produced)  bar:8  color:powderblue from:11/01/1980 till:11/30/1980  bar:9  color:powderblue from:06/01/1979 till:07/01/1979 text:SD40X (1979, 4 units produced)  

   fontsize:L   textcolor:black   pos:(370,30) # tabs:(0-center)   text:"SD40-Series Production Timeline"

Preservation

CP SD40 #5500 is preserved at the Revelstoke Railway Museum of Revelstoke, BC. It was CP's first SD40, built in 1966 at GMD's London plant and was retired in 2001. The unit was donated to the museum in 2007. Plans are being made to restore the locomotive to its original look as it was when ordered, including a repaint into its original grey/tuscan red paint scheme, known as the Canadian Pacific "Script".

Ex-CN SD40 #5232 (built November 1971) has been purchased by The Vintage Locomotive Society on January 10, 2015, from Cando and the Central Manitoba Railway. It is being used for revenue service by Prairie Rail Solutions, a wholly owned subsidiary of the Society. The unit has been repainted completely black, with Prairie Rail Solutions lettering and logos. It is VLSX 5232.

IC SD40-2R #6071, the first SD40 built, is preserved at the Monticello Railway Museum in Monticello, Illinois. It was originally the demonstrator for EMD, having the number #434. It was sold to the Gulf Mobile & Ohio and it became GM&O #950. The GM&O was later merged into the Illinois Central Railroad and became Illinois Central Gulf #6071, then later rebuilt into an SD40-2R for the IC. It was donated March 11, 2009. The engine is fully functional, however it needs new traction motors if it were to operate again.

In mid December, 2014, it was revealed that Norfolk Southern had set aside two SD40 units, that were retired in 2007, for preservation:

• NS SD40 #1580, built as Norfolk & Westen #1580, the first SD40 of the N&W. As of August 3, 2016, the locomotive was being worked on at the Juniata Shops in Altoona for eventual service & preservation.
• NS SD40 #3170, built as Southern #3170, the first SD40 of the SOU. It was restored to operating condition at the Juniata Shops in Altoona, Pennsylvania, and then sent to the NS Paint shops at the Debutts Yard in Chattanooga, Tennessee, where it made its public debut February 27, 2015. It operated on the NS Piedmont Division. On May 18, 2016, it was donated to the Tennessee Valley Railroad Museum by Norfolk Southern.^[6]

See also

• List of GM-EMD locomotives
• List of GMD Locomotives

References

• {{Pinkepank diesel spotters guide 2}}
• Sarberenyi, Robert. EMD SD40, SD40A, and SDP40 Original Owners. Retrieved on December 19, 2009
• Eck, H. C., The Modern Locomotive Handbook, 1977
• Service Department (1966). SD40 - SDP40 Operator's Manual. La Grange, IL: Electro-Motive Division of General Motors Corporation

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