Switzerland-Rome-Salzburg itinerary and train queries

For Speiz to Florence, which website do we use to book? sbh nor trenitalia show it. We though see above trains through trainline.eu. Is this website good? And how do we use Swiss travel pass from Speiz to Florence until the Swiss border?

It is up on Trenitalia, just make sure you use the proper spelling. Its Spiez and Firenze S. M. Novella.
However, if you have a valid Swiss Travel Pass, you can save by booking the same EC 51 train from Domodossola to Florence. You do not need to book tickets for Switzerland, just get on the trains. You will have seat reservations for the Domodossola to Milan section, so you might as well sit in them when you board in Spiez.

You have Day 6 and some locations out of order.

Day 6
Travel to Interlaken
Interlaken-Jungfrau, 2 hrs; lauterbrunnen-Staubbach falls, on way to Jungfrau
Stay overnight in Interlaken.

Day 4 and 5 you are in Wengen which is on the mountain rail road up to Jungfrau. Spend day 6 in Wengen and take an early train up to the Jungfrau from there.

You have some long train rides Rome - Salzburg and then Salzburg Lucern.

At the end most people on here would spend the last night in Lucern and take the train roughly an hour ride to the airport.

Thanks Sam. I see now on trenitalia and will go ahead and book the Domodossola to Florence + will reserve the seats.
Now how do I reserve seats until Domodossola with swiss travel pass? Is there a way? To make sure nobody has reserved the seats for that section of the journey? And we can sit in those seats from Spiez to Florence?

Thanks csu15269. Is it even worth staying in Interlaken? We are staying there to see things around it. If all is in the mountain then we can as well continue to stay in Wengen.

Thanks.

When you purchase tickets for Italian mainline trains, Freccia, EC and IC trains, the seat reservation is automatically included in the price. So you don't buy separate reservations.
The connecting Frecciarosso from Milan to Florence is a separate train and will include separate seat reservations.

Swiss trains only sell seat reservations at your option for 5 CHF. Usually, Swiss don't get seat reservations. Probably the only people who will have seat reservations are those continuing on to Italy and also have included seat reservations. So there may be people who jumped on the train and getting off in Switzerland. If they are sitting in your seats, you could ask them politely to move, or just sit nearby and take those seats when they get off.

Thanks, got it.

I am trying to buy swiss travel pass from sbb.ch. For some reason, it does not accept any of my credit cards. All come back as payment failed? Has anybody else faced this problem?

Buying Swiss Pass from SBB website: Have you told your bank that you will be making foreign transactions? Anything bought on the SBB (or any other Swiss website) is booked in Switzerland, which may trigger your banks fraud alert.
If not, you can buy your passes at Zürich airport station when you arrive for exactly the same price. but if your bank is still blocking foreign transactions you will again have a problem.

And to reiterate what the others say: no reservations needed (or usually possible) on Swiss trains. Once you have your pass, just get on, find a free seat and sit down.

SBB uses 3-D security. That means the card has to be registered with a PIN at something like Visa Checkout. When prompted during the transaction, you enter the PIN. Otherwise, American Express Card usually works.

Easiest, of course, is as Chris suggests and buy it at the airport train station when you arrive.