I've seen these around several different places, and now through the serendipity of a lot purchase on eBay I now own one. My question is: what the heck is it? Is it just a flat car with three tubs as a load? They work out to about 10' in diameter x 10' high. Who or what would use tubs that large? They appear to be made out of boards and they are open at the top so that rules out most industrial uses that I can think of. Are they intended to carry something? If so, what would be carried in 10' topless wooden tubs that couldn't be better carried is some other kind of car? What period do they belong in? The other cars that came with them aren't a clue, as they are a mishmash from all over the place (I got them primarily for the MT couplers) So, who can fill in the blanks on this one?