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This is a large, industrial dump truck found in the Ash Heap region of Appalachia. Interestingly, the cab is exactly the same one that is used on the bucket loader. They are used to ferry mined ores and minerals excavated by the giant Rockhound bucket-wheel excavator.
It somewhat resembles the famous real world Caterpillar 797 series dump trucks, albeit on a much smaller scale.
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