The investigation into Trenitalia aims to verify whether it is correctly displaying all fares when searching its ticketing database. According to claims made by individuals and consumer associations, passengers may be purchasing more expensive tickets than advertised because not all results are displayed.

Agcom is also investigating how NTV handles telephone customer service enquiries. Customers dial an urban number subject to a specified extra charge, and then have long waits and frequent call breaks which contribute to unexpected costs for passengers.

Both companies have already been inspected by a special antitrust team from the Financial Police.