UP Big-Boy, 4-8-8-4 by Key.
I used to have one of these by Tenshodo but sold it around 1980 so I could buy a 1962 Chevy impala SS convertible.
It doesn't have all the fancy movable hatches, coast drive, etc, that the previous northern has but it's nicely detailed and runs great. With a can motor, full cab detail, deck plate, see through walk boards and movable pilot coupler.
Come this Fall I've got a few engines to paint!
ps: the last picture was posted vertical, not sure why the software like to rotate it!
Sam