▁line ▁running ▁from ▁R or sch ach ▁via ▁Rom ans horn , ▁Kreuz lingen , ▁Ste ck born ▁and ▁Stein ▁am ▁Rhein ▁to ▁Sch aff hausen ▁and ▁forms ▁the ▁Swiss ▁section ▁of ▁the ▁ring ▁railway ▁around ▁Lake ▁Const ance . ▁ ▁History ▁▁ ▁On ▁ 1 5 ▁October ▁ 1 8 6 9 ▁the ▁section ▁of ▁line ▁from ▁Rom ans horn ▁to ▁R or sch ach ▁was ▁opened . ▁Not ▁quite ▁two ▁years ▁later , ▁on ▁ 1 ▁July ▁ 1 8 7 1 , ▁it ▁was ▁followed ▁by ▁the ▁Rom ans horn – K on st anz ▁line . ▁During ▁its ▁early ▁years ▁the ▁railway ▁belonged ▁to ▁the ▁Swiss ▁N ort he astern ▁Railway , ▁the ▁NO B , ▁which ▁was ▁transferred ▁in ▁ 1 9 0 2 ▁into ▁the ▁S BB . ▁ ▁In ▁ 1 9 9 6 , ▁the ▁line ▁was ▁taken ▁over ▁by ▁Mittel th urg a ub ahn ▁following ▁a ▁competition . ▁They ▁introduced ▁half - hour ly ▁fixed - interval ▁services ▁and ▁modern ised ▁both ▁track ▁and ▁rolling ▁stock . ▁When ▁Mittel th urg a ub ahn ▁went ▁bank rupt ▁in ▁ 2 0 0 3 ▁the ▁line ▁went ▁into ▁the ▁S BB ▁subs idi ary , ▁Th ur bo , ▁which ▁had ▁been ▁intended ▁as ▁a ▁joint ▁vent ure ▁between ▁the ▁S BB ▁and ▁Mittel th urg a ub ahn . ▁ ▁References ▁▁ ▁Category : R ail way ▁lines ▁in ▁Switzerland ▁Category : R ail way ▁lines ▁in ▁Baden - W ür ttemberg ▁Category