Oh Boy, I like tank cars...
Here are some old tin Athearn ho kit tank cars... with one stray Flyer ho Texaco tank tossed in for confusion.
And a bunch of Lionel 2654's
Prewar Alexander O scale kit built tank car. Cast Aluminum frame wood tank.
Another O scale wood tank with metal frame, this one hand lettered by Bill Lenoir
And a bunch of Walthers pre WWII kit built tank cars in O scale again.