"These beauties have nice proportions, husky yet not over long."
I read not long ago that the 2-6-6-2 was the most common articulated wheel arrangement in N. America. Of course, that includes every variation, including narrow-gauge locos.
Yup. I love 'em. Better-looking than the C&O's home-grown 2-6-6-2's (which did serve as a starting point for the USRA design's basic specs and dimensions), and my second-favorite articulated of all (#1 is the SP AC9 Yellowstone - so long as it's not painted yellow and orange).
Lionel has even used them, with minor changes, to stand in fairly plausibly, if not accurately, for some other RR's 2-6-6-2's.