How can I find rail pass just for Switzerland. thank you
There's info on the Swiss rail website, and passes can also be bought here on Rick's website.
You'll need to figure out what you'd pay for walk-up tickets, without a pass, to be sure a pass makes sense. One thing to be aware of is that the default prices shown on the SBB website assume that you hold the half-fare card (since most Swiss folks do). You need to double those fares to determine what you would pay out of pocket without any sort of rail pass.
Yes, there is a pass sold by the Swiss railway companies which covers the whole of Switzerland, including trains, buses and urban transport.
Details are here: http://www.sbb.ch/en/leisure-holidays/holidays--short-breaks-in-switzerland/swisstravelsystem.html
There is a map showing what it covers here: https://www.swisspasses.com/railpass/overviewmap_en.pdf
For Switzerland there are three options:
1) A Swiss pass. Covers everything except mountain railways, and gives you a 50% or 25% discount on those. See map.
2) Buy a Swiss half price card, and pay 50% for all tickets.
3) Pay full priced for all tickets.
You need to make a list of all the trips you will be doing in Switzerland and add up the prices for each of the three options, then decide which is best for you.
carolyn,
I believe this is what you're looking for.....
https://www.ricksteves.com/travel-tips/transportation/trains/switzerland-rail-passes
The topic of Railpasses for Switzerland is often complicated and requires some number crunching to determine which one will be best value for the specific touring you'll be doing (especially touring that involves mountain lifts).