--- In STMFC@..., Denny Anspach <danspach@...> wrote:
Red Ball produced an HO model of a Carbon Black covered hopper c. 1941 ff. From this slim piece of evidence, I would presume the prototypes arose in the '30s sometime.
If I'm not mistaken there are pictures of these cars in the Kalmbach reprint of the 1941CBC.
Carbon black is very fluffy (i.e. few lbs./cu ft.) and significant amount gets lost when it's packed in bags.
