High Quality Content by WIKIPEDIA articles! The Tay Bridge disaster occurred on 28 December 1879, when the first Tay Rail Bridge, which crossed the Firth of Tay between Dundee and Wormit in Scotland, collapsed during a violent storm while a train was passing over it. The bridge was designed by the noted railway engineer Sir Thomas Bouch, using a lattice grid that combined wrought and cast iron. Major engineering flaws were the cause of the collapse, and the disaster ruined Bouch`s reputation as an engineer.