 Although it is considered a separate route, the line is continuous after Dublin Connolly, where it connects with the Belfast–Dublin main line.The section between Westland Row (Dublin Pearse) and a point on the line just after Salthill and Monkstown station is the oldest railway line in Ireland, opening in 1834.At that time, the railway terminated adjacent to the start of Dún Laoghaire Harbour's West Pier, at a station called Dún Laoghaire.