Just to be clear. I own a 50s HO N&W Riv y6b but never will it run....I got it free believe it or not ! It's my Fav mallet but I'm code 83 or lower and she has deep pizza cutter flanges I'm not going to try to turn down, nor will I attempt a motor/drive train change and gut out that old archaic DC motor that takes up the whole cab (I'm NCE DCC)!! Though I will say this:
Someone could probably re-motor these guys and get a flywheel in there to boot !! Far as I know there are no steam with flywheels...This and low flanges would be narley, dude !!