Castleknock in Dublin's western suburbs gained a new station on the Midland Great Western Railway's line to Sligo in July 1990, as part of the first upgrade to the Maynooth suburban service. Until 1990 there was no railway station between Ashtown and Clonsilla, which nowadays has been heavily built up in the last 20 years. Castleknock Station platforms have been extended and upgraded as part of the latest suburban upgrade, and the one time container that issued tickets has been replaced by the standard modern ticket office, built around 2000. The original MGWR stone road overbridge at the east end of the station still survives.