Simple question on Trenitalia electronic tickets...
I'm planning the 'classic' a daytrip to Naples+Pompeii.
As i'm visiting in February, i would like to book the tickets online, but no longer than a week in advance, so i can, hopefully, choose a no rain day.
So, i'll be in Rome with no access to a printer.
If i buy a Frecciarossa ticket, do i need to print it out, or just show the code to the ticket guy inside the train?