Lumber doors on boxcars?

[Sumpter250]

I don't know if these wood ( ) have been used for timber - but they may be of interest

I'm not sure, but, the idea has kind of " GROAN " on me.

Some lumber Schooners had ( doors ), bow ports, for loading long planks, that were closed and caulked, before leaving port. One of these was the Maine-built four mast Schooner Anna R. Heidritter, launched in 1903. She was driven aground in a storm March 3rd 1942.
Somewhere I have a photo of an Auto Box car, with a load of 28' wood Whale Boats.