Railway gun - Wikiwand

A railway gun, also called a railroad gun, is a large artillery weapon, built on, transported by, and fired from a specially designed railway wagon. Many countries have built railway guns, but the best known were made by Krupp and used by Germany in World War I and World War II. Smaller guns were often part of an armoured train.

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Model of the French Gloire (1858), the first ocean-going ironclad