http://www.interrailnet.com/interrai...ss/switzerland
For travellers who are 26 years or older on their first day of travel.
Available in first or second class. A first class Pass is also valid in second class.
Only European residents can use an InterRail Pass.
A cheaper alternative, but difficult, is to get a TCV / SCIC-NRT ticket ( good for 2 months ).
http://europetrainsguide.com/forum/i...hp?topic=114.0
These are called routing tickets ie take 2 months to go from the border eg St. Margarathen / Basel / Chiasso to your last destination in CH.
I buy them cheaper in CZ or Slovakia.