▁ha u led ▁fre ight ▁trains ▁to ▁run ▁directly ▁from ▁K orn west heim ▁mar sh alling ▁yard ▁to ▁N ure m berg . ▁Comp ared ▁to ▁the ▁existing ▁route ▁via ▁the ▁Sch uster ▁Railway ▁to ▁Unter t ür k heim ▁yard , ▁where ▁trains ▁had ▁to ▁reverse ▁( with ▁the ▁locomot ive ▁running ▁around ) ▁in ▁order ▁to ▁continue ▁on ▁the ▁R ems ▁line , ▁the ▁new ▁route ▁acceler ated ▁fre ight ▁trains ▁by ▁ 3 5 ▁minutes . ▁ ▁S - B ahn ▁line ▁S 4 ▁has ▁been ▁extended ▁from ▁Mar bach ▁to ▁Back n ang , ▁replacing ▁Regional bahn ▁services . ▁To ▁create ▁this ▁S - B ahn ▁ring , ▁the ▁Frei berg – Ben ningen ▁section ▁needed ▁to ▁be ▁dup licated . ▁This ▁work ▁began ▁in ▁December ▁ 2 0 0 5 . ▁ ▁In ▁July ▁ 2 0 0 8 ▁the ▁particip ating ▁municipal ities ▁and ▁districts ▁signed ▁an ▁agreement ▁to ▁fin ance ▁the ▁extension ▁between ▁Mar bach ▁and ▁Back n ang . ▁This ▁allowed ▁the ▁S - B ahn ▁extension ▁to ▁open ▁on ▁ 8 ▁December ▁ 2 0 1 2 . ▁The ▁total ▁estimated ▁cost ▁of ▁the ▁works ▁for ▁the ▁extension ▁of ▁the ▁S - B ahn ▁amount ed ▁to ▁almost ▁€ 4 0 ▁million . ▁ ▁Oper ations ▁The ▁Back n ang – B iet ig heim ▁route ▁was ▁originally ▁built ▁as ▁part ▁of ▁an ▁east – west ▁axis ▁for ▁fre ight ▁transport . ▁To ▁a ▁much ▁less er ▁extent ▁there ▁were ▁also ▁long -