It is connected to both the Swiss railway network SBB-CFF-FFS , and the French SNCF network , including direct connections to Paris , Marseille and Montpellier by TGV . It is connected by Geneva Airport railway station with both the Swiss railway network SBB-CFF-FFS , and the French SNCF network , including direct connections to Paris , Marseille and Montpellier by TGV .