Since the Williams/2012 thread was getting threadbare (pun alert):
1 - A GM&O GP30, black-and-white (of course), hopefully with the proper AAR/"Alco" truck
side frames, as I know you have them for the scale FA's.
2 - a basic, $399.00 0-6-6-0 articulated, simple and flexible enough to get the toy-train
guys money, and accurate enough (in a freelance way) to get the bucks of us Hi-railers.
Operating mechanical front coupler a must! Tender and Tank versions possible (see Mantua HO 2-6-6-2).