Seeing as we've had "A Carload of Parfay", I went back to USC and found "A Truckload of Formay" - the product that started the Swift & Company discussion. I Googled "Wolf & Burk's Market Spot", and searched the City Directories, but got no results. The image is dated 1933.
USC Digital Library
For
e_r, here's a better picture of the Formay smokestack. It's part of a set of five photos called
"View of refinery exteriors, Southern California, 1934". The letters appear to have neon tubes, so it must've lit up at night.
USC Digital Library
And for
Earl Boebert and
Wig-Wag, here's another Swift refrigerator car. This one's got a "Carload of Swift's Brookfield mayonnaise for Peninsula Stores".
USC Digital Library
Just be careful your interest in refrigerator cars doesn't go too far - it could end in ...
ziffdavisinternational.com from L.A. Noire.