rol ley bus ▁system ▁() ▁forms ▁part ▁of ▁the ▁public ▁transport ▁network ▁of ▁St . ▁G allen , ▁the ▁capital ▁city ▁of ▁the ▁canton ▁of ▁St . ▁G allen , ▁Switzerland . ▁ ▁Open ed ▁in ▁ 1 9 5 0 , ▁the ▁system ▁is ▁currently ▁operated ▁by ▁ ▁( V BS G ). ▁ ▁, ▁it ▁consists ▁of ▁a ▁cross - city ▁line ▁and ▁three ▁radial ▁lines , ▁all ▁of ▁which ▁meet ▁at ▁St . ▁G allen ▁railway ▁station , ▁and ▁has ▁a ▁total ▁route ▁length ▁of ▁. ▁ ▁History ▁In ▁the ▁ 1 9 5 0 s , ▁the ▁t rol ley bus ▁system ▁gradually ▁replaced ▁the ▁. ▁ ▁The ▁last ▁tram ▁ran ▁on ▁ 3 0 ▁September ▁ 1 9 5 7 . ▁The ▁individual ▁t rol ley bus ▁line ▁sections ▁went ▁into ▁service ▁as ▁follows : ▁ ▁L ines ▁▁ ▁The ▁present ▁system ▁is ▁made ▁up ▁of ▁the ▁following ▁lines : ▁ ▁To ▁this ▁day , ▁the ▁Tro gener bahn ▁( T ro gen ▁Railway ) ▁runs ▁through ▁the ▁inner ▁city ▁between ▁the ▁station ▁and ▁Br üh lt or ▁on ▁the ▁rails ▁of ▁the ▁former ▁tram way , ▁and ▁thus ▁parallel ▁to ▁the ▁t rol ley b uses . ▁The ▁two ▁modes ▁of ▁transport ▁still ▁share ▁a ▁common ▁elect rical ▁subst ation . ▁In ▁the ▁relevant ▁section ▁of ▁the ▁common ▁route , ▁the ▁overhead ▁wire ▁voltage ▁is ▁only ▁ 6 0 0 ▁V ▁DC , ▁as ▁is ▁the ▁rest ▁of ▁the ▁t rol ley bus ▁system . ▁By ▁contrast