Hello PatriciaEgeland
The Centovallina? This is a lovely and scenic train line.
No, the Saver Day Pass is good to go.
Albeit the line goes from Italy to Switzerland, and one could think the pass is therefore not valid, it is fully covered by the Saver Day Pass as it also connects the Swiss people living in the Valais and Ticino.
For the Panoramic trains on that line, a very small surcharge of CHF/EUR 1.50 per passenger is collected by the train attendant on the train.
Kind regards,
Roland