here is a video showing the SANTA FE at war:
The run-by at 7:20 has 3 of the distinctive large C&IM coal gondolas. I don't doubt that these cars would have been in interchange, but I personally only saw them in home-road coal drag service. What could have been the reason(s) for just a few of them running on other roads?
Many thanks and greetings
Modeling the early post-war years up to about 1953