I have a Pre-Protosounds Railking NY Central Mohawk that is, IMO, a terrific locomotive. Here it is in action:
It is a smooth quiet runner, smoke is OK, not great (no fan driven smoke), but it is one of my favorite engines to run when my wife is asleep because it runs quietly.
It stopped running a few months ago, our own GGG fixed it for me, and now it's running great again. Arnold