Dart drivers have threatened to strike over a string of attacks on trains, including the hijacking of a carriage in Clongriffin last month.
There's also been a spate of windows being smashed after rocks have been thrown, while last Friday, passengers leaving the Liam Gallagher concert in Malahide were stuck at Portmarnock for around 90 minutes because of anti-social behaviour.
Drivers have told The Herald they don't want to operate services north of Connolly after 7 on a Friday because it's like heading into "bandit country and you don't know what's going to happen."
However Irish Rail's Barry Kenny has told 98FM News they're engaging with drivers on the issue. "We've confidence in the safety of the environment for both customers and employees. We're putting additional measures in place. Obviously drivers have indicated that there is the possibility of impacting on services, but we're confident the measures we're putting in place will address those concerns."