The 800 series engines are of the Genesis P-40 series and are a good substitute for a P-42 with nearly the same weights and power output, but there are fewer of them to go around.
Videos
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Amtrak engines 816 & 110 flying by Yarmouth Junction with Downeaster 691 and 5 cars on February 25th of 2017. Video by John Erickson.
Amtrak 691 westbound at Falmouth (CPF 192) with AMTK 818 and 90220 on September 28th of 2019. Video by John Erickson.
AMTK 818 & 90220 taking 681 through Winnocks Neck Rd on October 4th of 2019. Video by John Erickson.