Bob:
The Colorado Railroad museum has two building and site inventory records, one produced about 1905 and the other much later that show all buildings along the lines and usually the AFE authority and date of construction. Maybe they would help you with the puzzle. Contact the CRRM library and I am sure they could find the data for you.
Frank
PS: Was the Cresco booth the only "walk-in" of the group or were there others of that type?