...as lousy as it is, the Athearn tank car frame may also be suitableI did an article for RMJ several years ago (August, 1996?) on
Two models actually. One 12,500 gal (SP) and one 10,000 gal (GATX).
SP also had 50 (fifty) 8,000 gal GATC cars, class O-50-14. Probably
more than anyone else, now that I think of it! ;-)