Gustav Krupp von Bohlen und Halbach

Named after the head of the Krupp family, Gustav Krupp von Bohlen und Halbach, the Gustav Gun weighed in at a massive 1344 tons, so heavy that even though it was attached to a rail car, it still had to be disassembled before moving so as to not destroy the twin set of tracks as it passed over.

Gizmodo Andrew Tarantola 2011