Hi Elden,

Bethlehem Steel in Bethlehem, PA shipped large steel plates in the 1960s-70s that had to be loaded diagonally on edge in gondolas to fit in the clearance diagram.  I have some slides somewhere of a PC gon or two with the wooden rack that supported the plate and maybe with a plate load.  This maybe past the era of your interest, but if you want a scan, let me know, and I'll have to dig to see if I can find the slides.

Todd Sullivan