- level ▁power ▁supply ▁was ▁tested ▁there ▁only ▁in ▁early ▁ 1 8 9 6 ▁on ▁one ▁part ▁of ▁the ▁track . ▁Power ▁was ▁supplied ▁through ▁a ▁third ▁rail ▁but ▁a ▁system ▁of ▁contact ▁rel ays ▁ens ured ▁that ▁voltage ▁was ▁there ▁only ▁when ▁a ▁car ▁was ▁directly ▁above . ▁A ▁commission ▁recommended ▁the ▁system ▁be ▁extended ▁to ▁the ▁whole ▁track ▁but ▁it ▁was ▁never ▁realized . ▁▁ ▁In ▁ 1 9 0 5 , ▁a ▁similar ▁system ▁by ▁Fr anti š ek ▁K ři ží k ▁was ▁used ▁on ▁the ▁Charles ▁Bridge . ▁This ▁section ▁was ▁the ▁last ▁one ▁with ▁horse - dra wn ▁tr ams , ▁due ▁to ▁disapp ro val ▁of ▁overhead ▁lines ▁there . ▁Gr ound - level ▁supply ▁made ▁it ▁possible ▁to ▁elect r ify ▁this ▁track . ▁However , ▁the ▁weight ▁of ▁the ▁tr ams ▁caused ▁damage ▁to ▁the ▁bridge ▁due ▁to ▁v ibr ations , ▁which ▁is ▁why ▁they ▁were ▁replaced ▁by ▁rail ▁bus es ▁in ▁ 1 9 0 8 . ▁These ▁were ▁stopped ▁in ▁ 1 9 0 9 . ▁In ▁ 1 9 3 2 – 1 9 3 9 , ▁classic ▁bus es ▁on ▁ty res ▁were ▁operated ▁there . ▁Since ▁ 1 9 6 5 , ▁Charles ▁Bridge ▁has ▁been ▁a ▁ped est rian - only ▁zone . ▁ ▁Budapest ▁Another ▁system ▁of ▁ground - level ▁power ▁supply ▁was ▁used ▁by ▁Budapest ▁tr ams ▁from ▁ 1 8 8 7 . ▁Over head ▁lines ▁were ▁considered ▁an ▁eyes ore , ▁so