The Tay Rail Bridge was completed in February 1878 to the design of Thomas Bouch. At that time, it was the longest bridge in the world. Less than two years later, at approximately 7:15 p.m. on the stormy night of 28rd December 1879, the central navigation spans of the Tay bridge collapsed into the Firth of Tay at Dundee, taking with them a train, 6 carriages and killing 75 passengers.
Another famous bridge collapse was that of the Tacoma Narrows Bridge (USA). It was revolutionary in its design and historic in its collapse. This bridge was known for its tendency to sway in windstorms. The shape of the bridge was much like that of an aircraft wing, and under windy conditions, it would rise and falls like the movement of a galloping horse. On November 7th, 1940 a large windstorm turned the galloping motion into uncontrolled bucking, and the bridge collapsed.
There have been several other bridges that have collapsed. On October 17th 1989, several bridges in San Francisco, USA, collapsed as the result of an earthquake. Bridges are marvels of engineering, but when they collapse, the marvel turns into a tragedy with terrible consequences.