The station has been named Mallin Station since 1966, after Michael Mallin, although it is usually referred to simply as Dún Laoghaire. Until about three years ago I was unaware that it was named Mallin Station despite the fact that I used the station at least twice a day for about ten years.

The station features two through platforms and one terminal platform. Not many services use the terminal platform and in fact very few people were unaware that it existed. When I was based in Dun Laoghaire I could access the terminal platform without having to pass through any barriers but this has changed (not sure when).

The station is served by DART services, the South Eastern Commuter line, and InterCity services to Rosslare Europort via Wexford.

Unusually, the station building is located on a bridge above the platforms, in a setup similar to Leixlip Louisa Bridge railway station. The station has a ticket counter, automatic ticket machines and a small coffee shop/smoothie bar.