Book an RV in Contra Costa County and you are entering a world both natural and historical. Some other cities might be of interest to visitors, such as Pittsburg which had several names (New York of the Pacific, New York Landing and finally Black Diamond) before being granted its current name. Tracy was established in 1878 after a new rail line was built from Oakland to the shoreline of San Francisco Bay in order to avoid hills and maintain a constant elevation. Pleasanton was named after a Civil War general, Alfred Pleasonton, but a Washington D.C. recording clerk spelled his name wrong, resulting in the city's current name and spelling. San Mateo was unofficially started when a stagecoach stop opened in an abandoned mission near San Mateo Creek (it became more widely recognized with the arrival of the railroad in October 1863). San Jose is the center of Silicon Valley, the famed region of computer-technology related industries. Renting an Alamo travel trailer rental is the first step in recreating some of the journeys and explorations that led to the settling of this area and understanding what it has become.