Dublin Bus drivers' unions said last week's campaign to tackle vandalism and attacks on buses serving west Tallaght had been a success.
However, there are warnings that if the security campaign ends prematurely the service will be curtailed again.
The National Bus and Rail Union claims the increased Garda presence on the bus routes resulted in 12 arrests for anti-social behaviour last week.
Gardai confirmed that a number of arrests were made in relation to the attacks.
The full Tallaght service was reinstated on Friday, April 6th, after a week of curtailments which left thousands living in estates in west Tallaght with no evening buses.
An escalation of vandalism on bus routes serving the area since January, with incidents ranging from bricks thrown through bus windows from the roadside to a bus being "hijacked", prompted drivers to refuse to drive into the estates after 6 p.m.
The NBRU spokesman for the Ringsend garage, which serves the west Tallaght routes, said the full service would continue.
"It has been a great success," said Mr John McGrane, adding that the arrests had helped remove the threat of vandalism and violence.
The SIPTU bus branch president, Mr Pat Ward, said: "There has been a significant improvement in the area. There have been additional resources put in place, more bus inspectors on the routes and more gardai patrolling the area.
"We have to say we're happy as long as our drivers are not being attacked. There has been no indication of any attack on any of our members since the reinstatement."
Mr Ward said the union was monitoring the situation on a week-to-week basis and would be meeting with Dublin Bus management next week to insist that the additional resources remain in place for weeks or even months.