Hello Steph33
Please kindly note, your ticket is named Swiss Travel Pass; the SwissPass is a resident product.
That said, you need a ticket from Como to the Italian/Swiss border train station: This is either
- Chiasso, if you travel Como-Chiasso-Locarno-Domodossola-Brig-Zermatt
- Domodossola, if you travel Como-Milan-Domodossola-Brig-Zermatt
You need to book a ticket to Chiasso or Domodossola, and from there, your Swiss Travel Pass is valid. It allows you to travel at will on all major train lines / buses / tramways / boats; therefore, you can take any train within Switzerland.
In Italy, if you travel in Italy on an EC train, you need a seat reservation. On R, RE trains, you don’t.
In Switzerland, you only need a seat reservation for PE trains.
Purchase the Italian tickets from either trenitalia.com or sbb.ch/en.
You would have to further specify the route you are intending to take to give you more acurate advice.
Kind regards,
Roland