On 24 May 1847, five passengers were killed and many were injured in the Dee Bridge disaster. A Chester to Ruabon train fell into the River Dee, following the collapse of the Dee Railway bridge on the outskirts of Chester. A girder, which had cracked in the middle, gave way as the train crossed. The engine and tender managed to reach the other side of the bridge but the carriages crashed into the river. The bridge was engineered by Robert Stephenson despite warnings from civil engineer, William Fairbairn. He had warned Stephenson about the problems using cast iron girders only a few months before construction of the bridge at a meeting at the Institution of Civil Engineers in London, but his advice was ignored. A Royal Commission following this accident led to a re-evaluation of the use of cast-iron in railway bridges. Many new bridges had to be reinforced or rebuilt.