<page_title> Tianjin Metro </page_title> <section_title> Lines under construction </section_title> <table> <cell> 4 (Southern section) <col_header> Line </col_header> </cell> <cell> 19.4 <col_header> Length km </col_header> </cell> </table>
Tianjin Metro's Southern section of Line 4 will be 19.4 km long.