Because the shaft is nearly vertical, rocks riding inside shift a lot. To keep them from breaking down the door and raining into the shaft.
This is where the transformers were housed. Note the steel tracks in the floor for moving equipment around the building.
A twin-engine crew pushes full taconite cars onto Dock 6.
The only good shot I have of the top of Battery A, in the upper left. Though it seemed to have been disused before its neighbor it had a lot less growth on it.
Now, to add a human scale.
This was taken before the top of the docks really started to rot-out; now this stretch past the crane is distinctly unsafe to cross. Still, you can’t beat the view of Dock #2 winding into the distance, where the approach is chopped-off before the yard used to extend.
Looking down the Gilman-Belden tram.
A lime auger and massive feet of the lime hopper.
On the top floor of the former casket building is the finishing line for the coating section; on this section the final spray of plastic would hit the wood before a small furnace would seal the plastic permanently to the surface, making it more resilient, I assume.