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June 2, 2017: Causey Arch, England

 

The Causey Arch is a bridge near Stanley in County Durham, northern England. It is the oldest surviving single-arch railway bridge in the world, and a key element of the industrial heritage of England.

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It was built in 1725–26 by stonemason Ralph Wood, funded by a conglomeration of coal-owners known as the "Grand Allies" (founded by Colonel Liddell and the Hon. Charles Montague) at a cost of £12,000. Two tracks crossed the Arch: one (the "main way") to take coal to the River Tyne, and the other (the "bye way") for returning the empty wagons. Over 900 horse-drawn wagons crossed the arch each day using the Tanfield Railway.

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When the bridge was completed in 1726, it was the longest single-span bridge in the country with an arch span of 31 metres (102 ft), a record it held for thirty years until 1756 when the Old Bridge was built in Pontypridd, Wales. After he designed the bridge, Ralph Wood was so afraid that his arch would collapse that he committed suicide, but the bridge still stands today. Since no one had ever constructed such a large bridge, Ralph Wood relied on Roman Engineering for his design.

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An inscription on a sundial at the site reads "Ra. Wood, mason, 1727". Use of the Arch declined when Tanfield Colliery was destroyed by fire in 1739.

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The Arch was restored and reinforced in the 1980s. There are a series of scenic public paths around the area and the Causey Burn which runs underneath it. The quarry near the bridge is a popular spot for local rock climbers.

To put the age of this structure into perspective, when it was built, Captain James Cook had not yet discovered Australia!

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