The S90 is a railway service that runs every half-hour between Giubiasco and Lugano in the Swiss canton of Ticino. Every other train is extended from Lugano to Mendrisio. The S90 uses the traditional Gotthard line, making local stops bypassed by the Ceneri Base Tunnel. Treni Regionali Ticino Lombardia (TILO), a joint venture of Swiss Federal Railways and Trenord, operates the service.