Solved 2. (5 points) According to Wikipedia, Schwerer

Dora/Schwerer Gustav K. (E) Rail Gun, World War II Wiki

Schwerer Gustav, Wiki

Little David - Wikiwand

File:ЦМ ВОВ. Железнодорожный артилерийский транспортер ТМ-1-180

File:800 mm gun gustav in Soviet Union 1941.jpg - Wikimedia Commons

Could a Nazi Super Gun change the tide of war in Soviet and quickly destroy UK to avoid entry of US in WW2 which led to two front wars? - Quora

Schwerer Gustav railway cannon made using Create: Big Cannons. This took a lot of accidentally blowing up my build to make, enjoy. : r/feedthebeast

Large-calibre artillery - Wikiwand

A Shell and a Cartridge of the Schwerer Gustav Rail-Canon from WW2 in the Military Museum in Dresden. - 9GAG

Schwerer Gustav - The Greatest, And Most Useless Gun Ever Put Into