Kielder Viaduct ...

... according to the information plaque: In 1969, after being in use for 100 years, this railway viaduct was preserved for the public by the Northumberland and Newcastle Society through the generosity of many donors.  The viaduct was constructed in 1862 to carry the North Tyne Railway and is a notable example of Victorian engineering.  It is a rare and the finest surviving example of the skew arch form of construction.  This required that each stone in the arches should be individually shaped in accordance with the method evolved by Peter Nicholson of Newcastle-upon-Tyne, a pioneer geometrician in this field.

A not particularly inspiring image in the extra, but this is the point at which this section of the Border Counties Railway disappears beneath Kielder Water.

A grand day out with the Good Wife, exploring abandoned railways - I knows how to treat a goil.