A transport system has at least one track, preferably hung on supports or hanging from cables, on which transport cars may travel, by at east one trolley. The present invention provides concealed carrying of a weapon, preferably a handgun, by a law enforcement officer or the like. The actuator module can be equipped with a bi-stable holding brake having a first state permitting at least retraction of the ram and a second state preventing at least retraction of the ram. In a second embodiment, the locking member is pivotally connected with the first connector member for pivotal displacement between the unlocked and locked positions relative to the other connector member. The two horizontal struts is substantially perpendicular to the four support legs. By performing an exclusive-or on at least a portion of the third value and at least a portion of the first intermediate value, the key conversion system produces at least a first portion of the second key value, and at least a second portion of the second key value is produced as the second intermediate value.