<prompt> tafadhali geuza maudhui haya ya swahili kwenda kwa kiingereza.gebze halkalı line itafungua nini?: gebze-halkalı inaripotiwa kuwa line ya marmaray itafunguliwa katika robo ya kwanza ya 2019.  <response>: gebze halkalı when will the line open?: gebze-halkalı it is reported that marmaray line will be opened in the first quarter of 2019. 