The collapse of the Dee Bridge in May 1847 cannot be described without first mentioning some few words about the famous Ironbridge. If the Dee Bridge represented the bitter ending of the use of cast iron in railway bridge engineering (at least for spans of 10-12 metres and longer) then the Ironbridge – with its optimal semicircular arches represented the grandiose beginning (however, being just a road bridge, not intended for any railway traffic).