Tubular bridge

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Tubular bridge

Conwy Railway Bridge
Ancestor	Plate girder bridge
Descendant	Box girder bridge
Carries	heavy rail
Span range	Medium
Material	Wrought iron
Movable	No
Design effort	Very high
Falsework required	Depends upon length and degree of prefabrication

A tubular bridge is a bridge built as a rigid box girder section within which the traffic is carried.^[1] Famous examples include the original Britannia Bridge over the Menai Strait, the Conwy railway bridge over the River Conwy, designed and tested by William Fairbairn and built by Robert Stephenson between 1846 and 1850, and the original Victoria Bridge in Montreal.