You have to understand the nature of weapon design. First of all, it the objective. Railgun is intended for a ship mounted weapon, and basically used to destroy warships of enemies. The adventage of railgun over conventional bomb and missiles is that, there is no need for explosive projectiles, and that solves many problem. However, there are many aspects of weapon's objective. Currently, there is no challange to our navies from the sea, and secondly new power src is still under research. There really isn't a urgent need for such weapon, and to be honest, it isn't a much a decisive project like the starwar. There really no reason for a hypes.