text:  We're travelling on the newly extended north-south line 14. The first part of line 15, a mega-circle line, will open next year. Then, in quick succession, we'll open up the 16, linking suburbs way out east, the 17, that will go up to Roissy-Charles-de-Gaulle airport, in addition to the overground train that already goes there, and the 18, that will link suburbs way out to the south and west.