Dora Railgun

Trample
Dora was the name of a massive World War II German railway gun. It was developed in the late 1930's by Krupp for the purpose of destroying heavy fortifications, specifically the French Maginot Line. It could fire shells weighing seven tonnes to a range of 23 mi. It was the largest caliber rifled weapon in the history of artillery to see combat, and fired the heaviest shells of any artillery piece.