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N&W No. 605 on turntable - but where? - Classic Trains Magazine
Hello Helmut!
First off, I think I can tell you where it isn't, that's not the N&W's main maintanance facility in Roanoke.
The Class J's, of which 605 was one, typically ran between Norfolk VA and Cincinnati OH, so it could be in either one of those places.
Also, Class J's also were used on the Southern Railways trains the "Birmingham Special," the "Pelican," and the "Tennessean" between Monroe VA and Bristol TN.
My guess would be either Monroe or Bristol. Both are somewhat minor locations for N&W locomotives and that roundhouse looks a bit primitive compared to what the N&W normally would have.
Anyway, those are my guesses. Sorry I can't be more precise.
Wayne