It should be noted as well, from the pictures that I have found on the net as well as in the "Trails Among the Columbine" that the second chute did not come into play until the line was standard gauged. The pictures I have seen was says like Jerry stated, they put the cars up the storage track and then gravity feed down to the loader, and then gravity fed to the full storage tracks.
I'm modeling this spot as well, but had to take some quite large artistic licence due to space constraints.
Rio Grande 3rd Division in HOn3
Craig
Somewhere up in NoCo