Historic Stage Routes of San Diego CountyStagecoaches and the routes they traveled capture our imagination because of the romance, excitement, danger, and new experiences they represent. San Diego was part of one of the most significant stagecoach lines in history. The San AntonioSan Diego Mail Line was the first to provide fast and reliable mail service to and from the east. This was followed by the Butterfield Overland Mail. Many other stage lines crisscrossed the county. Stage stations