Walter Clark asked:

I seem to remember reading somewhere (maybe here) that the side sheathing
of single sheathed box cars was attached with bolts, while the kits we
have, including resin, show these as rivet heads. Was the attachment done
with bolts?

Certainly the SP single-sheathed cars all show that the attachments
visible on the outside of the car, connecting sheathing to posts and
braces, are nuts on bolts. I'd assume these are carriage-bolt type items,
with heads on the inside to keep the car interior as smooth as possible.
I'd guess that other owners of such cars used the same method.

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