Causey Arch.

This is Causey Arch, in County Durham. It was built in 1725-26 by Stonemason Ralph Wood, at the cost of £12,000, which the local coal-owners paid.
It is the oldest surviving railway bridge, and had two tracks. The main one for taking coal to the Tyne , and the other for returning the empty wagons.Over 900 horse-drawn wagons crossed the Arch each day.
The Arch was restored and reinforced in the 1980s.