Originally Posted by
RatherGhastly
Note that, as of last month, a new check-in requirement has been implemented for all regional train tickets acquired digitally, which is to say, using the TrenItalia app or web-site. Paper tickets still need to be validated using the machines on the platform, but holders of e-tickets must check in (again, using the app or the web-site) before boarding a train, and penalties do apply for failing to do
Correct, it's a new thing since August. For regional tickets, you buy one and then check-in before boarding. Bit of a faff but frankly not that much of a hassle.