Where do you validate the ticket?
con-va-LI-da — stress on third syllable. Si convalida: impersonal reflexive, said as one smooth phrase.
Ask this at the station when you have a paper ticket for a regional train and cannot find the yellow validation machine before boarding.
Si convalida is impersonal reflexive — 'one validates / you validate'. Il biglietto (the ticket). Convalidare means to validate or stamp. Only regional and local train tickets need validation — Frecciarossa and Intercity tickets do not.
Ho dimenticato di timbrare il biglietto.
I forgot to stamp my ticket.
Timbrare (to stamp) — colloquial synonym for convalidare
La macchinetta di convalida non funziona.
The validation machine is not working.
Report a broken machine to a ticket inspector before boarding
Il biglietto digitale si convalida?
Does the digital ticket need to be validated?
Mobile/app tickets generally do not need physical validation
Failing to validate a regional train ticket in Italy results in a fine of up to 200 euros — the 'I didn't know' excuse is almost never accepted. The machines are yellow and found at the entrance to every platform.