Dee Railway Bridge
Designed by Robert Stephenson
1847 This bridge was one of his few failures, collapsing under a train on 24th May 1847. Stephenson was heavily criticized for the design, even before the collapse, particularly for the poor choice of materials and the unsatisfactory disposition of the wrought iron trusses.
As a result a royal commission was appointed to investigate the application of iron to railway structures.
Stephenson made several more attempts to use cast iron in bridges.
The Dee bridge was later rebuilt using wrought iron.