▁the ▁Western ▁Pacific ' s ▁Bud d ▁Rail ▁Dies el ▁C ars ▁( R DC s ), ▁rep lac ements ▁for ▁the ▁Royal ▁G orge ▁( tra ins ▁No . ▁ 1 ▁and ▁ 2 ), ▁also ▁used ▁the ▁name ▁Ze phy ret te . ▁From ▁September ▁ 1 5 , ▁ 1 9 5 0 , ▁to ▁October ▁ 2 , ▁ 1 9 6 0 , ▁they ▁were ▁in ▁service ▁between ▁Oak land , ▁California , ▁and ▁Salt ▁Lake ▁City , ▁a ▁distance ▁of ▁, ▁which ▁made ▁the ▁route ▁the ▁longest ▁R DC ▁service ▁in ▁the ▁United ▁States . ▁ ▁Dec line ▁and ▁replacement ▁ ▁The ▁California ▁Ze ph yr ▁was ▁not ▁imm une ▁to ▁falling ▁passenger ▁travel ▁in ▁the ▁ 1 9 6 0 s ; ▁moreover , ▁it ▁began ▁to ▁lose ▁money ▁even ▁when ▁sold ▁out . ▁The ▁Western ▁Pacific ▁applied ▁to ▁dis continue ▁its ▁portion ▁in ▁ 1 9 6 6 , ▁but ▁the ▁Inter state ▁Com merce ▁Commission ▁( IC C ) ▁refused ▁after ▁public ▁out c ry . ▁The ▁D & R G W ▁made ▁the ▁same ▁request ▁in ▁ 1 9 6 9 ▁and ▁in ▁ 1 9 7 0 ▁the ▁I CC ▁permitted ▁Western ▁Pacific ▁to ▁end ▁its ▁portion , ▁provided ▁the ▁D & R G W ▁and ▁Bur ling ton ▁provide ▁" some ▁s embl ance ▁of ▁[ service ]" ▁between ▁Chicago ▁and ▁Og den , ▁Ut ah . ▁The ▁last ▁west bound ▁California ▁Ze ph yr ▁to ▁the ▁west ▁coast ▁left ▁Chicago