▁in ▁Chicago ▁on ▁the ▁California ▁Ze ph yr ▁were ▁made ▁available ▁for ▁use ▁on ▁the ▁Ak - S ar - Ben ▁Ze ph yr ▁for ▁an ▁over night ▁round ▁trip ▁to ▁Lincoln , ▁Neb r aska . ▁When ▁the ▁cars ▁returned ▁from ▁Lincoln ▁the ▁next ▁day , ▁they ▁were ▁placed ▁back ▁in ▁the ▁west bound ▁California ▁Ze ph yr ' s ▁consist ▁for ▁the ▁next ▁train ▁out ▁of ▁Chicago ▁that ▁afternoon . ▁ ▁During ▁the ▁winter ▁ 1 9 6 3 – 1 9 6 4 ▁season , ▁all ▁seven ▁ 1 6 - section ▁cars ▁were ▁with dra wn ▁and ▁re built ▁as ▁ 4 8 - se at ▁( non - d ome ) ▁coach es . ▁They ▁went ▁back ▁into ▁service ▁carrying ▁the ▁same ▁names ▁and ▁were ▁placed ▁between ▁the ▁b agg age ▁car ▁and ▁the ▁d ome ▁coach es ▁as ▁line ▁C Z 2 3 . ▁The ▁Bur ling ton ▁ren umber ed ▁their ▁cars ▁but ▁the ▁Rio ▁Grande ▁and ▁Western ▁Pacific ▁retained ▁the ▁existing ▁fleet ▁numbers ▁on ▁their ▁cars . ▁ ▁Pres ervation ▁ ▁The ▁high ▁quality ▁Bud d - built ▁cars ▁of ▁the ▁California ▁Ze ph yr ▁have ▁proven ▁to ▁be ▁popular ▁with ▁private ▁car ▁own ers . ▁Several ▁operate ▁in ▁private ▁char ter ▁service ▁on ▁Am tra k , ▁including ▁d ome - observ ation ▁car ▁Silver ▁Sol arium , ▁d ome - co ach ▁Silver ▁L ariat , ▁sleep ers ▁Silver ▁Rap id ▁and ▁Silver ▁Qu ail ▁and ▁a ▁d ome ▁l oun ge ▁now