Construction of the system is estimated to cost €3 billion and will open in four stages; in addition to the section opened in 2014, other sections will open in 2015, 2016 and 2020.
Anlægget af systemet er estimeret til €3 mia. og vil (foruden etapen fra 2014) åbne i tre yderligere etaper i 2015, 2016 og 2020.