Rome, May 28 - Italy's antitrust authority on Friday said it had opened an investigation into whether state-owned Ferrovie dello Stato (FS) rail company had abused of its dominant position to create obstacles for private rival NTV. The competition watchdog said it had opened the probe following complaints by rival Nuovo Trasporto Viaggiatori (NTV) filed between 2012 and May 2013. The Italian state railway and former monopoly has been faced with competition by NTV, which launched in 2012, promising to provide faster service with lower prices. The antitrust will review whether FS abused its dominant position in relation to access to the national rail network infrastructure, to the management of advertising space inside Italy's main train stations, as well as in the high-speed rail services for passengers market. The watchdog said it was investigating whether any actions took place that "could have slowed down the entry into the high-speed rail services market for the new entrant NTV, in favour of Trenitalia (FS) and creating disadvantages for the consumer". Trenitalia is a Ferrovie dello Stato unit.