What is "trans-dublin"

The Trans-Dublin is a railway route serving the city of Dublin and its surrounding areas. The route is used primarily by the DART service, and runs North-South along the east coast of Ireland. The route is divided into two parts over two different railway lines:

• Belfast to Dublin main line - This runs from Dublin Connolly to Belfast Central. The northern section of the Trans-Dublin operates between Dublin Connolly and Howth Junction, where it branches off. The main line continues to Malahide, while a short branch terminates at Howth.
• Dublin to Rosslare main line - This runs from Dublin Connolly to Rosslare Europort. The southern half of the Trans-Dublin runs as far as Greystones in County Wicklow.

The two sections of the route are connected through the centre of Dublin by the Loopline Bridge over the River Liffey between Dublin Connolly and Tara Street.