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Wikipedia definition
1. Railway gunA 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. Railway guns have been rendered obsolete by advances in technology.
Read “Railway gun” on English Wikipedia
Read “列車砲” on Japanese Wikipedia
Read “Railway gun” on DBpedia

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