Geograph - photograph every grid square

Both names are in current use. The OS maps it as Welland Viaduct, but Network Rail refer to it as Harringworth Viaduct, which has probably been the official railway name since it was built.

It was constructed in 1878 for the Midland Railway's new route between Nottingham and Kettering, designed to relieve the heavy traffic on the main line through Leicester. It provided a route for express trains between London and Nottingham as well as more capacity for coal traffic between the Midlands and the capital.

Built of brick, it consists of 82 arches, grouped in blocks of 9. It is the longest masonry viaduct across a valley in the British Isles, with a length of 1166 metres. The maximum height is 18 metres, and a feature is the relative uniformity of height due to the wide flat valley floor. It is Listed Grade II