Cotton Monorail The end of the monorail in the nitrating house. Similar Images ...based on the tags: chains, conveyors, infinity, machinery, peeling-paint, pillars, reflections, water... From the door where mine carts were dumped into the Concentrator, the erosion around the former Santiago Tunnel on Treasure Mountain is obvious. The rails barely connect to the ground anymore. Ready for some science? Strap-in and get your goggles. The east side of the boiler shop sported a platform with a control booth and heavy machine mounts. Note the door that replaces the lower section of stairs for explorers. David Aho pictured. Judging by the bed, this room was used by employees in its later years. Looking down the kiln line from atop the furnaces. See left. On the top floor of one of the old wards, the slanted roofline makes the this group room more claustrophobic. Portra 160.