I found a couple photos of the Marshall Pass passing siding. First one is from Trails Among the Columbines and is an Ed Haley photo showing the were the siding was in a 1955 photo from caboose 0574. The second photo is D. Rogers photo from the back of the Shavano taken from 1939 this photo from my personal collection. Hope this helps you Bob Meckley!
William
aka drgwk37