My husband and I will be coming to Vernazza from Florence on 25th June and then traveling from Vernazza to Milan on 26th June. I've managed to complete train bookings for all other legs of my journey except this part. My understanding is regional trains cannot be booked before a week of travel. Does that hold true for Intercity as well? Should I keep checking the trenitalia website for these tickets/can I book once we reach Florence (my understanding is price remains the same for regional trains?).