▁than ▁Vic Track . ▁ ▁Heritage ▁W - class ▁tr ams , ▁namely ▁on ▁the ▁City ▁Circle ▁tour ist ▁service . ▁Due ▁to ▁these ▁tr ams ▁being ▁limited ▁to ▁ ▁as ▁a ▁result ▁of ▁a ▁series ▁of ▁modifications ▁due ▁to ▁bra king ▁problems , ▁their ▁use ▁is ▁restricted ▁to ▁ensure ▁limited ▁inter ference ▁with ▁modern ▁tr ams . ▁ ▁In ▁ 2 0 0 3 , ▁Y ar ra ▁Tr ams ▁tri alled ▁a ▁se ating ▁layout ▁which ▁became ▁known ▁as ▁" A pol lo ". ▁The ▁trial ▁involved ▁removing ▁ 3 0 ▁seats ▁from ▁a ▁B - class ▁tram ▁and ▁replacing ▁the ▁removed ▁seats ▁with ▁" bum ▁ra cks " ▁which ▁are ▁found ▁in ▁Cit ad is ▁tr ams . ▁This ▁resulted ▁in ▁a ▁higher ▁capacity ▁for ▁standing ▁passengers ▁on ▁crow ded ▁services ▁during ▁peak ▁hours . ▁A ▁further ▁ten ▁tr ams ▁received ▁the ▁se ating ▁layout ▁during ▁ref urb ishment . ▁ ▁Nin ety ▁E - class ▁are ▁being ▁delivered ▁by ▁Bomb ard ier ▁Transport ation , ▁D anden ong . ▁ ▁T icket ing ▁ ▁Y ar ra ▁Tr ams ▁run ▁under ▁the ▁Public ▁Transport ▁Victoria ▁b anner , ▁as ▁do ▁other ▁operators ▁of ▁public ▁transport ▁franch ises ▁in ▁metropol itan ▁Melbourne , ▁and ▁use ▁the ▁my ki ▁ticket ing ▁system . ▁Met card ▁tick ets ▁have ▁not ▁been ▁accepted ▁on ▁tr ams ▁since ▁December ▁ 2 0 1 2 , ▁and ▁coin - only ▁Met card ▁ticket ▁machines ▁and ▁valid ators ▁have ▁been ▁removed . ▁Se ats ▁were ▁installed