Flying from USA to Zurich and will take train to Lucerne. Staying four nights.
Plan to go to Mt Titlis, Mt Rigi Cruise the Lake and train ride to Interlaken for scenic view.
Leaving by train and heading to Rome after visit. Can anyone help with suggesting what train pass would be helpful for doing each of these excursions. Thanks.
The Half Fare Card is what you need.
https://www.myswissalps.com/swisshalffarecard
If you don't have any stays planned between Luzern and Rome consider flying there from Zurich because the trains in Italy the majority of the time in my recent experience are always behind schedule.
Swiss Pass would work great for your trip needs…
A 4-day Swiss Pass (281 CHF) will fully cover all the segments of a Rigi round trip, plus your train to Engelberg and back with discounts for the Titlis lifts, and to Interlaken and beyond to the village of Mürren or Wengen. And also cover the train journey from Luzern to the Italy border.
If you book in advance (1-3 months ahead) for the train to Italy on the SBB website, you can get a special price of 68 CHF per person for the journey to Rome, taking into account your Swiss Pass. This is for the journey with 2 changes, at Arth-Goldau and Milano Centrale.