Rubuta ci gaba don wannan sakin layi - E. H. Harriman ne ya jagoranci Dumbarton Rail Bridge (wanda aka sani da Dumbarton Point Bridge ko, kawai, Dumbarton Bridge; daya daga cikin manyan gine-ginen layin dogo na Dumbarton Cut-off). Kafin a kammala Dumbarton Cut-off, an saukar da jigilar kayayyaki ta hanyar jirgin ƙasa a Oakland kuma an tura su zuwa San Francisco. Aikin farko ya fara ne a 1904 tare da la'antar ƙasa a Dumbarton Point, da kuma haɗa Kamfanin Railway na Central California, wanda jami'ai da yawa na Kudancin Pacific suka kirkira don kawai manufar gina layin dogo daga Newark zuwa San Mateo. Akwai wasu adawa ga gada daga kungiyoyin kasuwanci na gida, kuma Rundunar Sojojin Amurka na Injiniya ta gudanar da sauraron jama'a a watan Agusta 1906 ta gayyatar jama'a don ba da amsa game da tsare-tsaren gadar. Henry Rengstorff ya yi jayayya cewa gadar za ta hana zirga-zirgar ruwa, wanda ake buƙata a matsayin madadin hanya a yayin yajin aikin jirgin ƙasa ko bala'i, kamar girgizar ƙasa da ta faru kwanan nan
Ka yi haƙuri.