I got an email from the train company that according to their records I had a delay and they put a link in it to a online form to get my money back.

I was positively surprised at their proactive communication. The money was on my account within the week!

In Italy, for regional trains, since 2025 Trenitalia gives the reimboursement automatically to your credit card if you purchased the ticket electronically. [1]

[1] https://www.firstonline.info/en/trenitalia-rimborsi-automati...