Prime Mover Changouts is a free online Railroad Discussion Forum and Railroad Photo Gallery for railroaders, railfans, model railroaders and anyone else who is interested in railroads. We cover a wide variety of topics, including freight trains, passenger and commuter railroads, rail news and information, tourist railroads, railway museums and railroad history.


Steam Chaser
About two months ago, CNW 8646 had its engine changed out down in Texas. That got me thinking: How often do railroads change out prime movers? Do they base it off of mileage or hours, or something completely different? I heard that Amtrak's F40PHs had 2-3 million miles on them when retired, so how often were the prime movers replaced or rebuilt? Does anyone have any answers?

csx 381

New Member

I had a Unionpacific SD70M a few days ago and it had 1,135,074 and was built in 2004. thought that was pretty cool, since talking bout mileage. i dont know if the prime mover had been changed out or not. The SD70M behind it had 999,204 and it was built in 2002.
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