The number of public complaints have also reduced
Public order incidents on Dublin's Luas are down.
According to figures from operator Transdev, 2015 saw more than 700 incidents of public disorder reported by tram drivers.
So far this year, just 320 such incidents have been reported.
While public complaints were also reduced - from 590 last year to 174 so far this year.
The service carried 34.6 million passengers in 2015, with an average of 80,000 passengers per day.
There are 40 trams on the Red Line and 26 trams on the Green Line.
In 2010, security firm STT began working on the Luas due to an increase in anti-social behaviour.