ink eln ▁was ▁replaced ▁by ▁a ▁new ▁line ▁to ▁G oss au . ▁ ▁The ▁St . ▁G allen – G ais – App enz ell - B ahn ▁( S GA ), ▁which ▁opened ▁between ▁St . ▁G allen ▁and ▁G ais ▁in ▁ 1 8 8 9 , ▁and ▁was ▁extended ▁to ▁App enz ell ▁in ▁ 1 9 0 4 . ▁ ▁The ▁R he ine ck – W al zen hausen - B erg bahn ▁( R h W ), ▁which ▁opened ▁between ▁R he ine ck ▁and ▁Wal zen hausen ▁in ▁ 1 8 9 6 . ▁ ▁The ▁Tro gener bahn ▁( TB ), ▁which ▁opened ▁between ▁St . ▁G allen ▁and ▁Tro gen ▁in ▁ 1 9 0 3 . ▁ ▁The ▁Alt st ätten - G ais - B ahn ▁( AG ), ▁which ▁opened ▁between ▁G ais ▁and ▁Alt st ätten ▁in ▁ 1 9 1 1 . ▁ ▁The ▁S ä nt is bahn , ▁which ▁opened ▁between ▁App enz ell ▁and ▁Wasser au en ▁in ▁ 1 9 1 2 . ▁ ▁The ▁App enz eller bahn ▁and ▁Sant is bahn ▁merged ▁in ▁ 1 9 4 7 , ▁retain ing ▁the ▁App enz eller bahn ▁( AB ) ▁identity . ▁The ▁St . ▁G allen – G ais – App enz ell - B ahn ▁and ▁Alt st ätten - G ais - B ahn ▁merged ▁in ▁ 1 9 4 8 , ▁under ▁the ▁name ▁St . ▁G allen –