Luas operator Transdev spends €1.5m a year on security, the Herald can reveal.
The cost works out at five cent from every Luas ticket sold going towards policing Dublin's trams.
Private firm STT Rail Security, which is charged with keeping passengers safe while travelling on both tram routes, said the Red Line sees more incidents of anti-social behaviour than the Green Line.
Transdev says this is because the Red Line is 4km longer than the Green Line and runs through the busy city centre, making it more prone to unruly incidents.
The Green Line Luas travels from Bride's Glen to St Stephen's Green, while the Red Line operates between Saggart, Tallaght and the 3Arena.
Transdev said the majority of incidents involving anti-social behaviour take place after 5pm.
The company added that it tackles anti-social behaviour with "a rounded approach" that involves security staff, gardai and community and youth groups.
It said it is implementing measures to ensure passenger and staff safety including Operation Tramwatch, which sees Luas staff, security personnel and gardai blitzing Luas lines to check for rowdy behaviour.
Meanwhile, motorists who run red traffic lights at an accident blackspot which has seen numerous collisions with Luas trams will face three penalty points and a fine of up to €120 after an automated camera system was installed.
The cameras have been installed at the Blackhall Place-Benburb Street junction in response to the number of accidents there.
In an effort to improve safety, a camera linked to the Garda Pulse system will record any vehicle that runs the red light.
It is the first such system in Ireland and may be rolled out to other junctions. It was launched yesterday by Transport Minister Paschal Donohoe.
Since the Luas went into operation in 2004, there have been 338 collisions between trams and motor vehicles and 95pc have occurred on the Red Line.