it ▁System ▁consists ▁of : ▁▁ ▁OS Y ▁S . A . ▁() ▁▁ Β us ▁and ▁t rol ley bus ▁network ▁ ▁ST AS Y ▁S . A . ▁() ▁ ▁The ▁Ath ens ▁Tr am ▁system , ▁formerly ▁operated ▁by ▁Tr am ▁S . A . ▁ ▁The ▁Ath ens ▁Metro ▁old ▁line ▁Line ▁ 1 ▁and ▁new ▁lines ▁Line ▁ 2 , ▁Line ▁ 3 ▁ ▁T RA IN O SE ▁S . A . ▁() ▁ ▁A ▁sub urban ▁rail ▁system ▁using ▁H ellen ic ▁Rail ways ▁Organisation ▁( O SE ) ▁lines , ▁operated ▁by ▁Train O SE ▁S . A . ▁under ▁the ▁name ▁Pro ast iak os . ▁The ▁section ▁between ▁P ira eus , ▁Mag ou la ▁and ▁Kor op i ▁is ▁regarded ▁as ▁the ▁urban ▁part . ▁A ▁part ▁of ▁the ▁O SE ▁main ▁line ▁( between ▁P ira eus ▁and ▁Ag h ios ▁Stefan os ) ▁operated ▁by ▁Train O SE ▁S . A . ▁ ▁OS Y ▁and ▁ST AS Y ▁ ▁is ▁wh olly ▁owned ▁by ▁O AS A . ▁Train O SE ▁( for ▁its ▁Pro ast iak os ▁department ) ▁is ▁coordin ated ▁by ▁Ath ens ▁Urban ▁Transport ▁Organisation ▁( Organ ism os ▁Ast ikon ▁Sy ng oin on ion ▁Ath in on ▁- ▁O AS A , ▁), ▁a ▁public ▁company . ▁▁ ▁IS AP , ▁E TH EL ▁and ▁I LP AP ▁were ▁wh olly ▁owned ▁by ▁O AS A ▁S . A .. ▁A ME L