ent hal ▁and ▁left ▁the ▁current ▁route ▁at ▁Bei hing en - He ut ings heim ▁( now ▁part ▁of ▁Frei berg ▁am ▁Ne ck ar ). ▁The ▁section ▁between ▁Bei hing en - He ut ings heim ▁and ▁B iet ig heim ▁( now ▁called ▁B iet ig heim - B iss ingen ) ▁was ▁dam aged ▁during ▁the ▁Second ▁World ▁War ▁and ▁was ▁never ▁returned ▁to ▁operation . ▁ ▁Between ▁Ludwig s burg ▁and ▁Mar bach ▁the ▁line ▁has ▁been ▁part ▁of ▁the ▁Stuttgart ▁S - B ahn ▁network ▁since ▁ 1 9 8 0 . ▁The ▁Mar bach – Back n ang ▁section ▁is ▁currently ▁being ▁re built ▁so ▁that ▁it ▁can ▁be ▁integrated ▁into ▁the ▁S - B ahn . ▁The ▁Ludwig s burg – Back n ang ▁line ▁is ▁sometimes ▁referred ▁to ▁as ▁the ▁Kle ine ▁M urr bahn ▁(" L ittle ▁M urr ▁Railway "). ▁The ▁fully ▁elect r ified ▁and ▁partially ▁double ▁track ▁line ▁is ▁of ▁considerable ▁importance ▁for ▁fre ight ▁transport ▁as ▁a ▁link ▁between ▁the ▁K orn west heim ▁mar sh alling ▁yard ▁( K orn west heimer ▁Rang ier bahn hof ) ▁and ▁N ure m berg . ▁ ▁Route ▁ ▁Back n ang – L ud wig s burg ▁line ▁The ▁line ▁starts ▁in ▁the ▁height s ▁above ▁the ▁M urr ▁at ▁Back n ang ▁station . ▁While ▁the ▁M urr ▁Railway ▁runs ▁to ▁the ▁south west ▁and , ▁after ▁separ ating ▁from ▁the ▁Little ▁M urr ▁line ▁to ▁Ludwig s burg