Britannia Bridge Opens: Longest Span in the World Crosses to Anglesey
Robert Stephenson's Britannia Bridge opened across the Menai Strait, connecting Anglesey to the Welsh mainland using an unprecedented tubular iron design that allowed trains to pass through enclosed rectangular tubes. The structure proved that wrought iron could span distances previously thought impossible, directly influencing bridge engineering for the next century.
March 5, 1850
176 years ago
Key Figures & Places
What Else Happened on March 5
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