We have a winner!
Nice work.
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Making, or fitting, steam locomotive tires.
Piston rings?
I think that's probably the best guess. Massive piston rings.
OK, anyone know what's being built in this one?
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cheese storage?
The waste yard beyond the wall has a lot of product, wasted money?
Ralph
Maybe that's waste concrete columns removed from someplace and they decided to make a building out of some of them. Or a big chimney, or something.
The one's with two holes are obviously giant buttons.