The viaduct was completed in 1910, bridging the Callan River Valley.[1] It was originally part of the Castleblayney, Keady and Armagh Railway, though services to Castleblayney were ended in 1924 and from 1932 onwards,[2] all trains across the Tassagh Viaduct were goods trains to and from Keady- It was at this time that the nearby Tassagh Halt closed. The line had been taken over by the Great Northern Railway (Ireland) shortly after opening.[citation needed]
Final closure of the line and viaduct came in 1957. In December 1976, Tassagh Viaduct became a Grade B listed building.[3]
Design
The viaduct is 11 arches long, and at its greatest height, 24 metres. It is 174 metres in length, and built of concrete (piers) and brick (arches and vaulting).[4]
