Steam-era boxcar roof/end color Q

[NW Modeling List]

Hello all,In a moment of weakness, I bought a Kadee HO scale 40’ boxcar that poses as an N&W B8, with a 1953 build date in the 53000-53499 number group. Unlike most all others I’ve seen, this one has a black roof and ends. Izzat prototypical? The microscopic lettering on the car side denotes “For Clean Freight Only” — dunno if that makes any difference.Thoughts, memories, etc., welcomed.Thanks much,

Andre Jackson
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