Westport, Co.Mayo, is the terminus of the MGWR's line from Dublin which opened in 1866. In 1875, the MGWR built a short extension of the line down to Westport Quay station, later used by goods trains only until the late 1970s before it was finally lifted in the 1980/90s. Westport was also the starting point for the MGWR's branch line to Achill, which opened in 1895, never a profitable line, it was closed by the GSR in 1937. A short section of the Achill branch in Westport remained in situ until the late 1960s.

Westport Station has up and down platforms, which retain both their MGWR sandstone built station buildings. At the east end of the station on the down platform is the now redundant MGWR signal cabin, it's wooden structure partly rebuilt. The station footbridge is also original. At the west end of the station is the disused MGWR stone built goods and engine sheds. A stub of the Westport Quay line is now used for loading timber trains.