The C&O No.1309 Class H-6 (2-6-6-2) will be moved from B&O Museum to the Western Maryland Scenic Railway for a full rebuild. I would imagine there would be excellent opportunities to photograph and measure many hidden parts and assemblies. Some say it was one of the largest class of articulated locomotives east of the Mississippi.
OlPaint
__________________________ Chessie...Sleep Like A Kitten OlPaint
If you're still open for Ideas how about a RS18/18u. It's the Canadian version of the RS11 built by MLW. The main buyers were CN/CP back in 56-68, a lot of them are still in service with shortlines. They'd be great to have because I'm currently re-creating a shortline that still operates them (last photo)