N&W Class A 2-6-6-4 final assembly and testing.
Videos:
N&W Class A:
https://www.youtube.com/watch?v=mpn1TcoAKUY
Put a piece of brass rod in the coupling to keep it from bending and twisting.
There's, virtually, no play between the drivers and frame.
Awhile ago I added a back head as, originally, it had none.
GN Q-1 2-10-2: