Derivatives and Experimental
The SD40 was succeeded by an upgraded Dash 2 version called the SD40-2. 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.
The SD40E is an EMD SD50 rebuilt by the Norfolk Southern Railway and derated to 3000 HP.
A common product of rebuilding SD40s, and some times SD40-2s, is an SD40-3. The major addition that denotes said rebuilt unit or units as an SD40-3 is the addition of a micro-processor, and some times other modern components. The usual reasons for installing a micro-processor are improved traction control, and better fuel economy (via better injection control).
Read more about this topic: EMD SD40
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