Prime Mover Changouts

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stlgevo51

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
mileage

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.
CSX 381
 




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