6 7 , ▁which ▁was ▁connected ▁to ▁the ▁Bav arian ▁rail ways ▁in ▁ 1 8 7 5 . ▁To ▁improve ▁links ▁through ▁the ▁area ▁sp anned ▁by ▁the ▁square ▁of ▁lines ▁that ▁had ▁been ▁opened , ▁a ▁line ▁was ▁proposed ▁from ▁Wa ib lingen ▁on ▁the ▁R ems ▁Railway ▁to ▁Schw ä b isch ▁Hall ▁on ▁the ▁Koch er ▁Railway . ▁T ogether ▁with ▁the ▁G äu ▁Railway , ▁this ▁would ▁create ▁a ▁n ortheast – s outh west ▁line ▁through ▁Wür ttemberg , ▁running ▁through ▁Stuttgart . ▁ ▁In ▁a ▁speech ▁the ▁Wür ttemberg ▁Minister ▁of ▁Transport , ▁Karl ▁von ▁V arn bü ler ▁announced ▁on ▁ 2 8 ▁April ▁ 1 8 6 5 ▁that ▁the ▁M urr ▁Valley ▁Railway ▁would ▁be ▁built ▁from ▁Wa ib lingen ▁to ▁Schw ä b isch ▁Hall ▁with ▁a ▁branch ▁from ▁Back n ang ▁to ▁B iet ig heim . ▁The ▁Back n ang – B iet ig heim ▁line ▁came ▁to ▁have ▁a ▁high ▁strateg ic ▁importance ▁as ▁a ▁through ▁route . ▁The ▁plan ▁was ▁wel com ed ▁in ▁many ▁pet itions ▁from ▁the ▁communities ▁on ▁the ▁route , ▁but ▁the ▁town ▁of ▁Mar bach ▁in ▁ 1 8 6 4 ▁and ▁ 1 8 6 5 ▁called ▁for ▁a ▁railway ▁connection ▁from ▁Mar bach ▁to ▁B iet ig heim ▁or ▁Ludwig s burg . ▁ ▁After ▁the ▁Franco - Pr uss ian ▁War ▁of ▁ 1 8 7 0 - 1 8 7 1 ▁and ▁the ▁subsequent ▁Un ification ▁of ▁Germany ,