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"When Artillery First "Took to the Rails"

152 mm Finnish railway gun

"Railwaygun Web Museum". Retrieved April 21, 2005.

United States Navy Railway Batteries

US Army Railway Artillery in World War I

"Gun Train Guards Ends of Panama Canal -- Rolling Fort Crosses Isthmus in Two Hours" Popular Mechanics, December 1934 pp.844-845 excellent drawings in article on the 14-inch M1920 railway gun