Railway Guns, including: Obusier De 520 Modèle 1916, Krupp K5, Railway Gun, Bl 13.5 Inch Mk V Naval Gun, Type 90 240 Mm Railway Gun, Bl 12 Inch ... Gun, Bl 14 Inch Railway Gun, 21 Cm K 12 (e)

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More info: A railway gun, also called a railroad gun, is a large artillery piece, often surplus naval ordnance, mounted on, transported by and fired from a specially-designed railway wagon. Many countries have built railway guns, but the best known are the large Krupp-built pieces used by Germany in World War I and World War II. Smaller guns were often part of an armoured train.