Inventions - Armoured train: the ironclad railway weapons of modern warfare

Protected by heavy metal plating, armoured trains carried artillery, machine guns, and autocannons to rapidly transport massive firepower during the late nineteenth and early twentieth centuries. While vulnerable tracks and agile road vehicles eventually rendered them largely obsolete, specialized variants persisted, such as the United States Department of Energy's "White Train" for nuclear transport. More recently, Russian armed forces deployed improvised armoured trains in the Second Chechen War and during the invasion of Ukraine.

Source: Wikipedia