High Quality Content by WIKIPEDIA articles! The Boyne Viaduct (Irish: Tarbhealach na Bóinne), a 30m (98ft) high railway bridge, or viaduct, that crosses the River Boyne in Drogheda, carrying the main Dublin-Belfast railway line. It was the seventh bridge of its kind in the world when built and considered one of the wonders of the age. Designed by the Irish civil engineer Sir John MacNeill and built during the 1850s, completed 1855, the bridge is located near a tight curve, which necessitates the slowing of Iarnród Éireann trains and the joint Iarnród Éireann and Northern Ireland Railways Enterprise services before they approach. Prior to its construction railway passengers had to make their way, through the town, from the stations on either side of the river. The first train, weighing 75 tonnes, made its way across the river on 11 May 1853.During World War II, the viaduct was identified by the British as being of great strategic importance if they had to implement Plan W.