The '''Causey Arch''', located in [[County Durham]] north of Stanley, is the oldest survibving single-span [[railway]] [[bridge]] in the world. It was built 1725-26 to carry a wagonway (early railway built to carry coal wagons) across the steep-sided valley of the Causey Burn (''Causey'': 'causeway' referring to an earlier railway embankment; ''burn'': a stream).
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The '''Causey Arch''', located in [[County Durham]] north of Stanley, is the oldest survibving single-span [[railway]] [[bridge]] in the world. It was built 1725-26 to carry a wagonway (early railway built to carry coal wagons) across the steep-sided valley of the Causey Burn (''Causey'': 'causeway' referring to an earlier railway embankment; ''burn'': 'stream').