The system will allow people to discreetly alert security to any ongoing assaults, thefts or other harassment on board trains.
Irish Rail wants to make those kind of incidents easier to report.
From next month, a text alert system - similar to the one currently used on the Luas - will go live on DART and commuter services.
It'll be a discrete way for passengers to let staff know about any problems on board like threats, harassment or violence.
The company say they'll also be putting more staff on trains to crack down on anti-social behaviour.
It's hoped workers will be kitted out before the end of this year.