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I just recently read a history of GE locomotives "GE Locomotives, 110 Years of General Electric Motive Power" by Brain Solomon. It says here that GE had developed its new prime mover the 7HDL for the AC6000CW, but some roads namely, the Union Pacific, could not wait for the new engine, so they ordered the AC6000CW platform with a 7FDL engine that will be upgraded later. These were classed as a C44/60AC. So, these engines in fact have a different prime mover, but randy is correct in saying that an engine can be derated by changing the software, which controlles things like injection timing and throttle position, or in older locomotives making changes to the governor, and possibly changing the injectors as well.
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