Chris, believe it or not, I have found all those, and I have that drawing from the Car Builder's Encyclopedia.
Most of those are a bit too early.
I also have the White book, "The American Railroad Freight Car" which specializes in freight cars up to about 1910.
It's got a few drawings in it, but not of the era I'm looking for.
But...
Of those last 4 in your second post... especially the 3rd and 4th ones, you have much higher resolution versions
of those than what I could find.
Particularly the third one, that white-colored one taken in about 1880.
https://photos.app.goo.gl/aXZgZHDHAsTbMmTD6Are you able to get a super high res of that, good enough to pull up all the lettering on it?
I had found that 3-dome photo of a Union Tank Line car. It's a good shot, but it's a 3 dome.
I trying to narrow down things like lettering placement and a car number, but I can't find any real
UTL data anywhere, like a list of car numbers and dates, or just a darn photo of one labeled for
UTL taken in the 1890s. That would be the real brass ring to find.