A stimulation lead includes a lead body having a longitudinal surface, a distal end, a proximal end, and a shaft extending along at least a portion of the distal end of the lead body. One of the tangs is provided with a pivotally connected screw, which passes through an aperture in one end. The graphic symbol is then identified by matching a profile of the image intensity to a predetermined image intensity profile associated with a given graphic symbol. The private key is incorporated together with a bunch of private keys produced in the past into a data reading program. Other embodiments are described and claimed. The coupling assembly preferably provides sufficient support during a rail face impact to direct an impacting vehicle back onto the roadway.