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Well, it's got 16 of those solid metal cubes, plus the cart weight. According to wikipedia, "The density of steel varies based on the alloying constituents but usually ranges between 7,750 and 8,050 kg/m3 (484 and 503 lb/cu ft)"
They look like about 2.5 feet cubed to me, which is 15.6 cubic feet. So 15.6 x 16 x 503 = 125,750 pounds. Plus the weight of the cart.
Of course, I can't see anything to use as a frame of reference for size except that a man has to be able to stand on that grate on the left. So my 2.5 feet cubed estimate could be way off. And if the cubes are 3 feet, then that would bump us up to 217,296 pounds. Plus the cart.
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