. ▁Since ▁ 2 0 1 8 , ▁the ▁line ▁has ▁run ▁through ▁the ▁R uck hal de ▁T unnel ▁on ▁a ▁decl ine ▁of ▁ 8 . 0 %, ▁losing ▁about ▁ 7 0 ▁metres ▁in ▁alt itude , ▁to ▁the ▁level ▁of ▁the ▁once ▁important ▁S BB ▁fre ight ▁yard ▁in ▁St . ▁G allen . ▁The ▁tunnel ▁replaced ▁the ▁last ▁remaining ▁ra ck ▁section , ▁which ▁had ▁impress ive ▁view ▁of ▁the ▁western ▁parts ▁of ▁the ▁city , ▁and ▁the ▁sharp ▁R uck hal de ▁curve . ▁The ▁tunnel ▁also ▁made ▁an ▁approximately ▁ 3 0 0 ▁metres - long ▁section ▁of ▁overhead ▁line ▁that ▁had ▁been ▁shared ▁with ▁the ▁St . ▁G allen ▁T rol ley bus ▁super fl uous . ▁Due ▁to ▁the ▁lower ▁voltage ▁of ▁the ▁t rol ley bus ▁network , ▁the ▁two ▁forms ▁of ▁transport ▁were ▁elect r ically ▁isolated ▁from ▁each ▁other . ▁The ▁section ▁with ▁an ▁S - cur ve ▁leading ▁to ▁St . ▁Leon hard ▁bridge ▁will ▁be ▁replaced ▁by ▁a ▁new ▁double - track ▁section ▁next ▁to ▁the ▁S BB ▁St . ▁G allen – W inter thur ▁railway ▁by ▁the ▁end ▁of ▁ 2 0 2 1 . ▁After ▁passing ▁under ▁the ▁St . ▁Leon hard ▁bridge ▁the ▁line ▁reaches ▁the ▁so - called ▁St . ▁G allen ▁Neben bahn hof ▁(" side ▁station "), ▁where ▁a ▁connecting ▁building ▁provides ▁covered ▁access ▁to ▁the ▁standard - g au ge ▁trains ▁of ▁the ▁S BB , ▁SO B ▁and ▁Th ur