I have been on the train websites RS suggests but each time I enter the search, it tells me the information is invalid. Does anyone know if there is NOT train service between Pisa and Venice in June "07? At one site I saw a train the was to take 6 1/2 hours but then I couldn't get the info back again.
Your problem is that new timetables for most of Europe will go into effect on 10 June. Enter an earlier date at either trenitalia.com or bahn.de and you will see many choices. The times are not likely to change much, if at all, after 10 June.
From Pisa, you will take the local train to Florence. From Florence, get the Venice Express.