H BF ) ▁the ▁tram ▁system ▁and ▁the ▁Rh ine - Main ▁S - B ahn ▁meet . ▁While ▁some ▁older ▁lines ▁like ▁the ▁Ober wald haus - / Mart ins v iert el - / and ▁Ost bahn hof ▁lines ▁were ▁closed , ▁new ▁sections ▁were ▁built , ▁following ▁the ▁development ▁of ▁new ▁resident ial ▁areas , ▁e . g . ▁the ▁new ▁lines ▁to ▁K ran ich stein , ▁Ar he il gen ▁north ▁and ▁Als bach ▁south . ▁Since ▁the ▁ 1 9 9 0 s ▁the ▁tram ▁system ▁has ▁gradually ▁been ▁modern ised . ▁All ▁lines ▁( except ▁for ▁line ▁ 3 ) ▁have ▁since ▁been ▁less ▁of ▁a ▁classical ▁tram ▁system ▁and ▁more ▁of ▁a ▁light ▁rail ▁system ▁( St adt bahn ) ▁with ▁a ▁private ▁right - of - way ▁and ▁separate ▁stations ▁with ▁" same - level - platform s ". ▁ ▁L ines ▁ ▁The ▁central ▁hub ▁of ▁the ▁D arm stadt ▁tram ▁network ▁is ▁the ▁" L uis en platz ", ▁at ▁which ▁eight ▁of ▁D arm stadt ' s ▁nine ▁tram ▁lines ▁stop . ▁On ▁the ▁main ▁routes ▁the ▁hours ▁of ▁operation ▁are ▁usually ▁from ▁around ▁ 5 : 0 0   am ▁until ▁ 1 : 0 0   am . ▁The ▁network ▁is ▁currently ▁made ▁up ▁of ▁the ▁following ▁lines : ▁ ▁All ▁lines ▁run ▁– ▁unless ▁otherwise ▁stated ▁– ▁at ▁ 1 5 - min ute ▁intervals ▁( at ▁night ▁and ▁on ▁Sunday ▁m orn ings ▁at ▁ 3 0