english bridge written metre long iron bridge wales bridge designed george built employer support carry limestone water works grade listed building scheduled ancient monument world earliest surviving iron railway bridge history founded grew world largest early 19th century works obtained right quarry limestone quarry use works blast gauge built carry limestone quarry plant situated shortly downstream confluence form previously built upstream plant river built convey water works conveyed cast iron elevated ran north bank crossed crossing entering works power foot cast iron water wheel known ground level crossed supplied water brick works levels carried elevated bridge built january june replacing previous wooden structure world oldest known iron railway bridge elevated trough carrying removed having replaced south bank river design present bridge designed george george trained carpenter chief engineer partner business bridge composed cast iron frame supporting rectangular foot inch cast iron trough lower trough carried acts supporting plates acting railway rail chairs cast wooden attached iron passed apex frames supported upper trough carrying reflecting designer roots members composing joined joints commonly wooden structures heritage august bridge listed grade listed building reference number listed scheduled ancient monument reference number refurbished local authority
Pont-y-Cafnau