I guess the other question is, how realistic is it for my late 1940s to mid 1950s era SP California layout to feature such a car? Would Frisco gons have been seen off line much by this time? Or at anytime for that matter?
Assume for a minute that the SLSF gon would appear on the SP in California only if there was some commodity could be loaded on the Frisco that somebody in California wanted. Who would be the consignee and what would be the commodity?