Cool.
Once in awhile, one stumbles across something new!
I happen to find that the smoke box door opens on my Key UP 4-8-4 FEF-2 engine.
This engine is 'super' detailed with movable sand hatches, access doors open to steam piping on top of boiler in front of cab, cab roof hatch open, cab doors open, hatches on tender open and coast drive. Very nice model that is factory painted.
The headlight also works.