A German Krupp K5 railway gun during World War II.

The Krupp K5 series all were consistent in mounting a 21.5 m (70.5 ft) long barrel in a box mounting. This mounting was then mounted on a pair of 12-wheel bogies designed to be operated on commercial and military rails built to German standards. K5 development began in 1934 with first testing following in 1936.

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