Not Just For Automobiles
This photo link below is from a website (http://dalakarl.com/project00.html)
about the restoration of a Aeronca KCA-14 airplane.
I know very little about airplanes but I can certainly identify a boxcar:
Caption: “The way in which Aeroncas travelled to California in those days was by boxcar. There is a picture of one such sister ship being loaded at the factory in one of the Aeronca books.”