Dora was a massive World War II German 80 cm K (E) railway siege gun. This is the second of two. The first as call the Schwerer Gustav. They were developed in the late 1930s by Krupp for the express purpose of destroying heavy fortifications, specifically those in the French Maginot Line. They weighed nearly 1,350 tonnes, and could fire shells weighing seven tonnes to a range of 65 kilometres (40 mi). Credit to the artist.
This is a German 240mm Rail Gun, captured by American soldiers in the spring of 1945. The Germany Army utilized many rail guns such as this, hiding them in tunnels during the day to avoid aerial attack and rolling them out to fire at night. As large as this gun seems, the biggest rail gun used by the Germans (and one of the largest guns in history) was a 800mm gun called “Schwerer Gustav.”
Schwerer Gustav and Dora -- These two monstrous German 80 cm railway siege guns are the largest caliber-rifled weapons ever. They were used in live combat during World War 2. They have the heaviest ammunition shells ever in history.