<page_title> Yokohama Municipal Subway </page_title> <section_title> Lines </section_title> <table> <cell> Line 4 <col_header> Line </col_header> </cell> <cell> Green Line <col_header> Name </col_header> </cell> <cell> 2008 <col_header> First section opened </col_header> </cell> <cell> 13.1 km (8.1 mi) <col_header> Length km/miles </col_header> </cell> </table>
The Green Line (line 4) was opened in 2008, with an operating distance of 13.1 km.