 These first stations were at most a brush corral and a jacal to house the keeper, while most were merely camping places at springs or stream crossings; camps would be made where the coaches stopped for the night.Only the three at San Antonio, El Paso and San Diego had substantial buildings.The largest and most important station between El Paso and San Diego was at Maricopa Wells, Arizona, the dividing point on the route, where the eastbound and westbound mails met and turned back.