Bridge to Factory One of the many fireproof bridges connecting the factory sections, one way to prevent fires from spreading throughout the plant. Related Similar Images ...based on the tags: rusty, skyways, snow... Winter skies over Allouez Bay. From a distance, it looks almost fragile. The two exhaust vents coming out from the boilers en route to the stacks. Plywood marks where where catwalks were removed to extract equipment. The ‘working’ part of the furnaces are about a story above ground level, so the catwalks snake above the tree line. 2010. A skyway connecting two Which tube carried the beer? I hope it’s the big one! Looking at the side of the Superior Elevator from the tracks that feed the Western. Note the old flagpole. Another. Planet. Coal crushers and the coke loading line. A long exposure under the trestle-like approach to the dock, under which trains still pass regularly. Looking out of the top of the grain tower at Duluth. A colorful makeshift wall.