The existing Paris metro network is to be expanded from 220 km by an
additional 200 km with the Grand Paris Express by 2030. The planned
expansion involves extensions to the existing lines 11 and 14, as well as
new lines 15, 16, 17 and 18. Moreover, 68 new stations are to be built. The
construction of the Supermetro automatique regional will double the size of the Paris metro network, thereby surpassing the London Underground. The required financing for this megaproject is estimated at 35 billion euros.