Mar 11, 2016 - 8:02 AM
Hi GOHL, welcome to our MySwissAlps!
If you intend to do intensive traveling in Italy and Austria as well, a Eurail Select Pass may suit your needs. If only a few train transfers are involved, you'd better consider regular tickets for Italy and Austria. You can only tell for sure by making a detailed list of plans and calculating as explained here.
For the Swiss leg of your journey, it's better to look into Swiss rail passes as Eurail Passes don't provide the best coverage, especially for the region you'll be exploring. The Swiss Half Fare Card could be a good option. It's valid during one month and will thus provide a 50% discount on all of your rail trips in Switzerland, including the last portion to Zurich on day 14. Again, calculations would have to prove whether this is indeed the best choice.
When doing the maths and looking for prices in the timetable, please make sure to avoid typos. Otherwise the timetable may not be able to recognize your destinations. E.g.: Gimmelwald, Grindelwald, Schilthorn.