This question is asked and answered ALL the time. Do a search for past postings. BUT you will notice a constant drum beat, BUY IT THERE, BUY IT THERE, BUY IT THERE ,,,,,,,, Americans are only used to one type of public transit -- airlines -- with limited capacity and crazy ticket pricing. So it is quite natural for us to think that we have to reserve years in advance to get a seat and a good price. Unfortunately some trains lines are adopting the crazy advance pricing. But for the most part, especially in Italy, they have not. We have traveled in peak tourist season (summer months) and have NEVER missed a train. Overnight, sleeping berths is a different isssue but for routine daily train service you can always go. It would have to be a very rare problem to not have a seat for you on any train. BUY IT THERE !!!!!!~