Castleblayney is another one of those important stations on the former GNR Irish North West line, which ran east from Dundalk right across to the west at Bundoran. Unfortunately this extensive network of lines lost their passenger services in 1957, before finally closing completely in 1959. Castleblayney was also the junction for an additional line to Armagh which ran via Keady, and diverged from the INW line at Castleblayney West. This line opened fully in 1909, but rather surprisingly had a short life, with the section to Keady closing in 1923, and the section to Armagh in 1957 to goods (passenger traffic had been withdrawn as early as 1932).

The station building at Castleblayney remains, identified by the GNR yellow brick chimneys. Only the platform retaining wall on the railway side is intact, all other buildings, such as the adjacent goods shed, have been demolished.