▁until ▁July ▁ 1 6 . ▁With ▁the ▁change ▁of ▁route , ▁Am tra k ▁renamed ▁the ▁train ▁as ▁the ▁California ▁Ze ph yr . ▁The ▁modern ▁California ▁Ze ph yr ▁uses ▁mostly ▁the ▁same ▁route ▁as ▁the ▁original ▁east ▁of ▁W inn emu cca , ▁Nev ada . ▁The ▁train ▁uses ▁the ▁route ▁of ▁the ▁former ▁City ▁of ▁San ▁Francisco , ▁along ▁the ▁Over land ▁Route ▁( First ▁Trans cont inental ▁Rail road ), ▁between ▁El ko , ▁Nev ada ▁and ▁Sac r amento . ▁Ac ross ▁central ▁Nev ada , ▁the ▁two ▁rail ▁lines ▁have ▁been ▁combined ▁to ▁use ▁direction al ▁running . ▁As ▁such ▁the ▁exact ▁spot ▁the ▁train ▁switch es ▁lines ▁depends ▁on ▁the ▁direction ▁of ▁travel . ▁ ▁Route ▁description ▁Both ▁the ▁Current ▁and ▁original ▁iterations ▁of ▁the ▁California ▁Ze ph yr ▁operated ▁on ▁Chicago , ▁Bur ling ton ▁and ▁Qu in cy ▁( today ▁part ▁of ▁B NS F ▁Railway ) ▁between ▁Chicago ▁and ▁Den ver , ▁and ▁the ▁former ▁Den ver ▁and ▁Rio ▁Grande ▁Western ▁main ▁line ▁from ▁Den ver ▁to ▁Salt ▁Lake ▁( today ▁part ▁of ▁Union ▁Pacific ▁Rail road ' s ▁Central ▁Cor rid or ). ▁West ▁of ▁Salt ▁Lake ▁City ▁the ▁modern ▁California ▁Ze ph ry ▁dep arts ▁Salt ▁Lake ▁on ▁the ▁Sh after ▁Sub div ision ▁of ▁the ▁former ▁Western ▁Pacific ▁Rail road , ▁as ▁did ▁the ▁original . ▁However , ▁in ▁central ▁Nev ada ▁the ▁train ▁changes ▁to ▁the ▁Over land ▁Route , ▁the ▁route ▁used ▁by ▁the ▁City ▁of ▁San