▁and ▁Tr am ▁S . A . ▁until ▁June ▁ 2 0 1 1 ▁were ▁subs idi aries ▁of ▁Att iko ▁Metro ▁S . A . ▁( ), ▁a ▁company ▁that ▁is ▁currently ▁wh olly ▁owned ▁by ▁the ▁Greek ▁government . ▁ ▁Train O SE ▁S . A ., ▁which ▁absor bed ▁the ▁former ▁Pro ast iak os ▁S . A . ▁in ▁ 2 0 0 7 , ▁became ▁independent ▁of ▁the ▁O SE ▁group ▁in ▁ 2 0 0 8 ▁and ▁is ▁now ▁a ▁separate ▁private ▁company . ▁ ▁O AS A ▁regularly ▁conduct s ▁street ▁phot ography ▁and ▁vide ography ▁compet itions ▁both ▁in ▁black - and - white ▁and ▁in ▁colour ▁for ▁photos ▁taken ▁while ▁inside ▁its ▁means ▁of ▁transport . ▁ ▁Picture ▁gallery ▁ ▁See ▁also ▁ ▁Ath ens ▁Railway ▁Station ▁ ▁List ▁of ▁bus ▁routes ▁in ▁Ath ens ▁ ▁References ▁ ▁External ▁links ▁ ▁O AS A ▁companies ▁established ▁in ▁ 2 0 1 1 ▁▁ ▁O . A . S . A . ▁- ▁Ath ens ▁Urban ▁Transport ▁Organisation ▁ ▁ST AS Y ▁S . A . ▁ ▁OS Y ▁S . A . ▁ ▁Non - O AS A ▁companies ▁▁ ▁Train O SE ▁sub urban ▁services ▁▁ ▁O . S . E . ▁- ▁H ellen ic ▁Rail ways ▁Organisation ▁S . A . ▁▁ ▁H ellen ic ▁Ministry ▁of ▁Transport ation ▁and ▁Communic ations ▁ ▁* ▁Category : Inter modal ▁transport ▁authorities ▁Category : R ail ▁transport ▁in ▁Att ica <0x0A> </s> ▁Dam