Advice on train travel and cost

Hello Margaret! You'll be making quite some long and expensive train journeys, so yes: a rail pass will certainly save you money. There would be several options for your itinerary. The Swiss Half Fare Card (please find details here) would be fine, but note that you will have to buy discounted train tickets for each trip. In all, I think the Swiss Saver Pass (please see this page) would be the most comfortable solution for your itinerary, as you won't have to buy additional tickets for most journeys. I don't know the duration of your stay though; maybe an 8 day variant would be fine. If you do like fee traveling, but only on a number of days and not on all days, please take a look at the Swiss Saver Flexi Pass here.

These guidelines allow you to calculate which options is cheapest for your plans; this overview may also serve as a starting point.

Does that get you started? You're welcome to get back with further questions!