Buuxi weedha soo socota: Buundada Tareenka ee Dumbarton (oo markaa loo yaqaanay Dumbarton Point Bridge ama, si fudud, Dumbarton Bridge; mid ka mid ah dhismayaasha ugu waaweyn ee khadka tareenka ee Dumbarton Cut-off) waxaa difaacay E. H. Harriman. Kahor dhammaystirka Dumbarton Cut-off, xamuulka tareenka ee transcontinental waxaa laga dejiyay Oakland waxaana loo raray San Francisco. Shaqada hordhaca ah waxay bilaabatay 1904 iyada oo la cambaareeyay dhulka Dumbarton Point, iyo isku-darka Shirkadda Tareenka ee Bartamaha California, oo ay abuureen dhowr sarkaal oo ka tirsan Koonfurta Baasifigga ujeedada kaliya ee dhismaha khadka tareenka ee Newark ilaa San Mateo. Waxaa jiray diidmo ka dhan ah buundada kooxaha ganacsiga maxalliga ah, iyo Ciidanka Mareykanka ee Injineerada waxay qabteen dhageysiga dadweynaha bishii Agoosto 1906 iyagoo ku casuumay jawaab celinta dadweynaha ee qorshayaasha buundada. Henry Rengstorff wuxuu ku dooday in buundada ay caqabad ku noqon doonto taraafikada biyaha, taas oo loo baahan yahay waddo kale haddii ay dhacdo shaqo joojin tareen ama masiibo dabiici ah, sida
Dhulgariirkii dhawaa.