interesting N&W hopper classes that made it to late 1967 - early 1968

[NW Modeling List]

If one threw one's modeling era back to the era mentioned, what would be an interesting 2 or 3 bay N&W hopper class that had a lot of character, eg, signs of multiple rebuilding etc, and was still being interchanged, into the early PC era ? 
Something notable, but not so rare as to stretch credulity.
regards, 
Ben S. 
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