From Wicklow on, semaphore signalling was used until April 2008, when the entire line was upgraded to the mini-CTC system controlled from Dublin Connolly.

At that time, the railway terminated adjacent to the start of Dún Laoghaire Harbour's West Pier, at a station called Kingstown.

On the electrified DART section between Dublin Connolly and Greystones, trains typically run every 10 minutes during peak hours on weekdays, approximately from 06:50 to 20:00.

[6] Some Northern Commuter services also originate at Grand Canal Dock, extending to Drogheda MacBride or Dundalk Clarke stations.

Additionally, some South Western Commuter services begin at Grand Canal Dock and continue as far as Hazelhatch and Celbridge.

The 05:35 service from Rosslare Europort to Dundalk Clarke, previously the longest train route on the island of Ireland by duration, was discontinued in the timetable change of September 2024.

[11][12] On a few Sundays during the summer the Railway Preservation Society of Ireland operates the "Sea Breeze", a steam hauled train with heritage carriages, between Dublin and Wexford/Rosslare.

Fianna Fáil Senator Malcolm Byrne labelled the proposal as "short-sighted," expressing concerns about potential inconveniences for commuters and a decline in public transport attractiveness.

Local councillors and rail users echoed these sentiments, fearing that mandatory transfers would deter passengers, particularly the elderly and those with mobility challenges.