S20 (TILO)The S20 is a railway service that runs every half-hour between and in the Swiss canton of Ticino. Treni Regionali Ticino Lombardia, a joint venture of Swiss Federal Railways and Trenord, operates the service.WWW tilo.ch/Collegamenti/Coll...OperationsThe S20 runs every 30 minutes between and, using the Gotthard line from Castione-Arbedo to and then the Giubiasco–Locarno line to Locarno.