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Boyne ViaductThe Boyne Viaduct, a 98ft high railway bridge, or viaduct, that crosses the River Boyne in Drogheda, carrying the main Dublin–Belfast railway line. Designed by civil engineer Sir John MacNeill and built during the 1850s, the bridge is located near a tight curve, which necessitates the slowing of Iarnrd ireann and the joint Iarnrd ireann and Northern Ireland Railways Enterprise services before they approach the south side of the bridge. The bridge was originally built to accommodate two tracks, but when refurbished, this was reduced to one to allow heavier engines to cross. The newest and heaviest locomotives in Ireland are only allowed to cross one at a time (no double-heading).
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