Irish Rail has advised commuters to anticipate 'significant' disruptions to the Greystones to Dalkey route for the week.
The DART services between Greystones and Dalkey has been affected due to a fire last Friday.
The incident in Bray caused "significant fire damage to signalling equipment."
The fire occurred in a signalling relay room on Friday night.
In a statement, Irish rail said there will be no services running between Greystones and Bray, from Monday 21st to Friday 25th.
A limited bus transfer will be available to customers between the stations.
A bus transfer will be provided between Greystones Station and Bray/Dun Laoghaire/Dublin Connolly Stations for Rosslare/Wexford-Dublin services.
Timetables and journey time have been impacted between Bray and Dalkey.
To plan your journey, Irish rail recommends checking the journey planner which is available here.
Dublin Bus will continue to accept rail tickets at all times for journeys to and from areas south of Dalkey.
Customers can also connect to and from Dublin Bus services in the city centre, Blackrock and Dun Laoghaire.
Irish Rail has issued an apology to customers for the inconvenience caused.
