This rather dramatic picture is of the manufacturing process of a cast tank hull. While the photo does not have a caption, we think this is the hull of a Swiss PZ 61 or Pz 68 tank. If that is correct, then this photo would be of a facility of the George Fischer company of Schaffhausen.
Tank and AFV News 
That’s not casting, that’s heat treating!
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True.
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I wonder how long it takes to get that much metal up to that kind of temperature.
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Looks like oil bath tempering of the pre-heated casting. The hull will have been cast , fettled (de-scaled), runners and risers removed, then reheated to homogenise, before quenching. Looks amodern plant.
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