, ▁the ▁remainder ▁of ▁the ▁Tro gener bahn ▁route ▁was ▁energ ised ▁at ▁ 1 , 0 0 0 ▁V ▁DC . ▁It ▁now ▁forms ▁part ▁of ▁the ▁App enz ell – St . ▁G allen – T ro gen ▁railway ▁and ▁the ▁section ▁that ▁was ▁energ ised ▁at ▁ 1 , 0 0 0 ▁V ▁DC , ▁is ▁now ▁energ ised ▁at ▁ 1 , 5 0 0 ▁V ▁DC . ▁ ▁In ▁Ri eth üs li , ▁the ▁termin us ▁of ▁Line ▁ 5 , ▁there ▁is ▁an ▁inter change ▁station ▁for ▁changing ▁between ▁the ▁t rol ley bus ▁system ▁and ▁the ▁elect r ically ▁operated ▁App enz ell – St . ▁G allen – T ro gen ▁railway . ▁Before ▁the ▁opening ▁of ▁the ▁R uck hal de ▁T unnel ▁and ▁r er out ing ▁of ▁the ▁line ▁in ▁ 2 0 1 8 , ▁the ▁two ▁systems ▁used ▁common ▁overhead ▁c aten ary ▁pol es ▁at ▁that ▁station ▁and ▁susp ension ▁w ires ▁for ▁about ▁, ▁but ▁were ▁elect r ically ▁isolated ▁from ▁each ▁other . ▁ ▁Line ▁ 4 ▁has ▁existed ▁only ▁since ▁ 9 ▁December ▁ 2 0 0 7 . ▁Pre viously , ▁line ▁ 1 ▁had ▁had ▁three ▁different ▁term ini ▁from ▁ 1 9 9 1 , ▁and ▁four ▁from ▁ 1 9 9 6 . ▁ ▁Fle et ▁ ▁Ret ired ▁fleet ▁▁ ▁The ▁original ▁group ▁number ed ▁ 1 0 1 – 1 1 8 , ▁the ▁fleet ▁that ▁opened ▁the ▁system