Signals In case power was lost, this manual signal could direct trains on and off the taconite trestle. Turning the pole would change the color of the light on top and the shape of the metal flags. Similar Images ...based on the tags: bokeh, cables, lights, rusty, signs, vignettes... A small stage in one of the barracks. The top of the barracks staircase. Ava on an upper catwalk. Much of the circa-1950s buildings remain with few alterations, such as these long boring sheet metal ruststicks. The bottom of the elevator in the new foundry. The vibrant colors clashed with the silent hotel. A sign on the corner of a laboratory remembers. This ruined skyway looks like it should be at ground level because of the growth, but it’s actually the second floor of the building. Hunter climbing up to the coal tower.