▁S out heast ▁Steph ens ▁Street ▁to ▁the ▁project ' s ▁eastern ▁termin us ▁at ▁O MS I . ▁▁ ▁In ▁July ▁ 2 0 1 1 , ▁the ▁city ▁council ▁agreed ▁to ▁contract ual ▁changes ▁that ▁reduced ▁the ▁number ▁of ▁street c ars ▁on ▁order ▁from ▁six ▁to ▁five ▁due ▁to ▁un antic ip ated ▁costs ▁related ▁to ▁the ▁cars ' ▁production . ▁United ▁Street car ▁had ▁dep ended ▁on ▁Czech ▁firm ▁Š k oda , ▁which ▁built ▁the ▁system ' s ▁first ▁street c ars , ▁to ▁build ▁the ▁new ▁street c ars ' ▁prop ulsion ▁system ▁but ▁these ▁failed ▁accept ance ▁testing . ▁Port land ▁officials ▁opt ed ▁instead ▁to ▁source ▁the ▁prop ulsion ▁system ▁from ▁Wisconsin - based ▁Rock well ▁Autom ation , ▁but ▁Rock well ▁was ▁still ▁developing ▁its ▁design ▁at ▁the ▁time . ▁They ▁then ▁purs ued ▁Aust rian ▁manufact urer ▁El in ▁to ▁produce ▁a ▁prop ulsion ▁system ▁for ▁the ▁prototype ▁while ▁they ▁await ed ▁Rock well . ▁Ch anges ▁to ▁the ▁prop ulsion ▁system ▁necess itated ▁changes ▁to ▁the ▁street car ▁design ▁in ▁order ▁for ▁the ▁street car ▁to ▁accommod ate ▁a ▁different ▁form ▁factor ; ▁this ▁ultimately ▁delayed ▁the ▁project ▁and ▁raised ▁the ▁cost ▁of ▁manufact uring . ▁ ▁Open ing ▁and ▁closing ▁of ▁the ▁loop ▁ ▁The ▁ ▁east side ▁extension ▁opened ▁on ▁September ▁ 2 2 , ▁ 2 0 1 2 , ▁after ▁a ▁five - month - long ▁delay . ▁Due ▁to ▁over la pping ▁sections , ▁Port land ▁Street