Security guards will begin operating across the Dublin Bus network on Monday, as a 20-week pilot scheme gets underway with the aim of enhancing safety.
Two teams of security guards will operate on the north and southside of the city during peak hours.
The number of reported incidents of anti-social behaviour on Dublin Bus services has doubled since 2019.
Fianna Fáil senator Mary Fitzpatrick said security will "have a presence, but not a forceful presence".
She said they will "intervene when the situation requires", but if situations "get beyond a point that is within their confidence or their remit, then gardaí obviously would be engaged".
"It represents a critical step in making our public transport system safer for everyone and an initiative I have long championed to ensure that everyone on public transport, whether employee or passenger, feels protected from anti-social behaviour."
The pilot program will see the introduction of two dedicated mobile security units, one deployed on the northside of Dublin and the other on the southside.
These teams will operate daily during peak travel hours, from 2pm to 2am Sunday through Thursday, and 4pm to 4am on Fridays and Saturdays.
"This initiative is not only about ensuring personal safety but also about restoring public confidence in the safety of Dublin’s public transport system," Fitzpatrick said.
"Public transport plays a crucial role in reducing our carbon footprint. A secure and reliable network is key to encouraging more people to leave their cars behind and contribute to our climate objectives.
"This is a landmark moment for Dublin Bus, and I look forward to seeing the positive impact this pilot will have on safety, security, and ultimately, public confidence in our transport network."
