Causey Arch
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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: a stream).
Further information
http://www.durham.gov.uk/durhamcc/usp.nsf/pws/Durham+Wildlife+Sites+-+Causey+Arch+Wood