Today I purchased tickets for Sunday, September 24, 2023 on Trenitalia. I booked 1st class for 3 people and I added 2euros for each person for partial refund if I wanted to change my ticket.
The cost for 3 tickets = 59.70euros + 6euros for the partial refund. Total 65,70euros.
Time: 9:03-12:03. Stops: 4 Class: 1st
I am posting this for your information because I have been trying to figure out how their train schedule works. I hope this helps those who are looking for a way to Rome from Pisa.
Also, the High Speed trains from Florence are also another option.
Thank you to all those who have been a help to me while planning our vacation. Much less stress when you can find the answer here.
Keep On Traveling!