A firearm used in military applications may have a plurality of accessories that can be attached to the weapon, with each accessory having a need for electric power. In order to reduce the weight of these power-consuming accessories, as well as the proliferation of batteries used to power these power-consuming accessories, a Powered Rail provides a point of mechanical and electrical interconnection for the power-consuming accessories with a common power source. The Weapon Accessory Control System is provided to enable the user to control the activation of a power-consuming accessory as well as enable communications between the user and the power-consuming accessory and among power-consuming accessories.