▁tram way ▁in ▁the ▁Swiss ▁cant ons ▁of ▁App enz ell ▁Inner rh oden ▁and ▁Aus ser rh oden ▁and ▁the ▁city ▁of ▁St . ▁G allen . ▁It ▁is ▁the ▁ste ep est ▁ad hes ion ▁railway ▁in ▁Switzerland ▁with ▁a ▁gradient ▁of ▁up ▁to ▁ 8 . 0 % ▁and ▁forms ▁part ▁of ▁the ▁network ▁of ▁the ▁App enz ell ▁Rail ways ▁( AB ) ▁and ▁the ▁St . ▁G allen ▁S - B ahn . ▁The ▁line ' s ▁two ▁branches ▁were ▁completed ▁in ▁sections ▁between ▁ 1 8 8 9 ▁and ▁ 1 9 0 4 ▁by ▁the ▁St . ▁G allen - G ais - App enz ell - Alt st ätten ▁Railway ▁and ▁the ▁Tro gen ▁Railway . ▁The ▁two ▁lines ▁were ▁connected ▁by ▁the ▁AB ▁with ▁a ▁cross - city ▁route ▁in ▁ 2 0 1 8 . ▁ ▁History ▁ ▁St . ▁G allen - G ais - App enz ell ▁railway ▁▁ ▁The ▁former ▁St . ▁G allen - G ais - App enz ell - Alt st ätten - B ahn ▁( St . ▁G allen - G ais - App enz ell - Alt st ätten ▁Railway , ▁A St ) ▁opened ▁the ▁line ▁from ▁St . ▁G allen ▁to ▁G ais , ▁popular ly ▁known ▁as ▁the ▁G ais er bahn , ▁on ▁ 1   Oct ober ▁ 1 8 8 9 . ▁The ▁continu ation ▁from ▁G ais ▁to ▁App enz ell ▁followed ▁on ▁ 1   J uly