Chappel Viaduct

The Chappel Viaduct is a railway viaduct that crosses the River Colne in the Colne Valley in Essex, England. It carries the Gainsborough Line which now is a short branch linking Marks Tey in Essex to Sudbury in Suffolk. The line previously, however, extended to Shelford in Cambridgeshire.
It was completed in 1849 by the Eastern Union Railway, which was later absorbed into the Great Eastern Railway. It is the longest bridge in the East Anglia region at 1,060 feet (320 m), and one of the largest brick-built structures in the country.

A view of the ovaloid gaps within the piers, designed to save bricks
The viaduct consists of 32 30-foot (9.1 m) semi-circular spans, with tapered piers; it is 1,060 feet (320 m) long and rises to a maximum height of 75 feet (23 m). The piers consist of two shafts, separated by a 6-foot (2 m) opening, joined at the top and bottom by arches. Each shaft contains a hollow void up to 4 feet (1.2 m) by 3 feet (1 m), partially filled with concrete to the level of the bottom arch. The running level of the viaduct has a gradient of 1 in 120.