Ever since WW2 the idea of an electromagnetic rail gun hitting air, sea, and land targets seemed like a good idea. In Germany, a 150mm rail gun was designed at Peenemunde to fire projectiles at London at Mach 4. The only problem was that the huge gun would need a power plant to operate it. Eng. Hansler proposed an AA Electric Gun in 40mm that was lab tested before the end of the war. It equally took up too much power, so the US and Britain passed on the idea. But with more powerful warships (some with nuclear reactors) the idea resurfaced with the USN and RN by the 2000s. Demonstrators were built of more advanced design and lower power efficiency. It is proposed to mount single EMRGs on Destroyers but perhaps also on a new series of modern multi-turreted Dreadnoughts that could pound targets hundreds of miles away or kill missiles in flight. BAe made the first one followed by US General Atomics (The Blitzer)! Trials start in 2016 at sea.