This is not really my bailiwick, but don't you have to make a distinction between what the packer could carry in their meat reefers, versus what the billboard adverting was touting?
In Chapter 3 of the Hendrickson and Kaminski billboard reefer book, there are a number of meat-packer cars advertising lard, butter, cheese, eggs and, yes, even Old Dutch Cleanser (in 1929 and 1932 photos of Cudahy cars).
I have never tracked down the 1919 ICC ruling, but it doesn't seem that it was very cut-and-dried. Or am I missing something?
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Dave Parker
Swall Meadows, CA