Steam:
Big boy and Challengers are my favorite Steam engines. I love how they added 8 large wheels and the SP Forward cab too but the sound is terrible. I also liked the Sp 4449 Daylight, American and NKP steam.
Diesel:
My favorite diesel is NS heritage: NKP, Pennsylvania, Regular NS and CSX. ES44 Gevo from railfan3600. SD70ACe first pack, SD75 SF Warbonnet inside the cab

that digital speedometer is awesome!, love the horns. PC42 Amtrak, horn is okay.
Electric:
What I found so far in the us route and only 1 I like is Amtrak Acela. Love how they did the designs outside.
Thats pretty much it. Will be more later on.