User blog comment:USS Enterprise CVN-65/Magnetic Accelerator Cannons (MACs)/@comment-24903406-20140907235233/@comment-27822411-20140908000813

I heard of the railway cannon. It was also known as the V-3 super cannon. It was built by the nazis to fire shells at long distances to destroy London. Luckily, the Allies took over the station before they could use it.