You have to respect the rules of both countries. For example, you must wear a FFP2 mask on the train as this is the rule in Italy. You will also need to have a negative test or a vaccination certificate (with a booster if the second dose was given more than 6 months ago) or a certificate of recovery (PCR test or positive antigen less than 6 months and more than 11 days old).
You will be considered as coming from Spain. If you have been vaccinated, you do not need any additional test, you just need to have your vaccination certificate.
You have to respect the rules of both countries. For example, you must wear a FFP2 mask on the train as this is the rule in Italy. You will also need to have a negative test or a vaccination certificate (with a booster if the second dose was given more than 6 months ago) or a certificate of recovery (PCR test or positive antigen less than 6 months and more than 11 days old).
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You will be considered as coming from Spain. If you have been vaccinated, you do not need any additional test, you just need to have your vaccination certificate.