description EMD SDP40F Overview
The EMD SDP40F is a six-axle C-C diesel-electric passenger locomotive built by General Motors Electro-Motive Division for Amtrak. Production began in 1973, and the model used a 3,000-horsepower prime mover with passenger equipment that included an onboard steam generator. A series of derailments during the mid-1970s led to investigations by Amtrak, EMD, the FRA, and the AAR, while the precise interaction of locomotive, track, and train consist remained disputed. [Federal Railroad Administration report](https://rosap.ntl.bts.gov/view/dot/10115/dot_10115_DS1.pdf)
help EMD SDP40F FAQ
When was the EMD SDP40F built for Amtrak?
EMD began producing the SDP40F in 1973 for Amtrak. It was a six-axle C-C passenger locomotive built by General Motors Electro-Motive Division.
How powerful was the EMD SDP40F?
The SDP40F used a 3,000-horsepower diesel engine. Its passenger equipment also included an onboard steam generator for heating passenger cars.
Why did Amtrak replace many SDP40Fs?
The SDP40F developed a reputation for stability problems, especially at speed and on certain track conditions. Amtrak later replaced many of them with locomotives such as the EMD F40PH.
What locomotive replaced the SDP40F in Amtrak service?
The EMD F40PH became Amtrak's better-known passenger locomotive during the 1970s and 1980s. It was shorter and better suited to Amtrak's changing operating needs than the SDP40F.
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