I have the MILW version - It is 10.4" over the knuckles...
Jim
Modeling BNSF and Milwaukee Road in SW Wisconsin
It's probably 10" or slightly less. The engine is very similar in overall size to the Bachmann 2-8-0.
Andre
I'm trying to figure out if it would fit into a Campbells Quincy Enginehouse (11") for my dual gauge shortline