The Digswell Viaduct, also called Welwyn Viaduct, is a railway viaduct that carries the East Coast Main Line over the River Mimram in the

county A county () is a geographic region of a country used for administrative or other purposesL. Brookes (ed.) '' Chambers Dictionary''. Edinburgh: Chambers Harrap Publishers Ltd, 2005. in some nations. The term is derived from the Old French denoti ...

Hertfordshire Hertfordshire ( or ; often abbreviated Herts) is a ceremonial county in the East of England and one of the home counties. It borders Bedfordshire to the north-west, Cambridgeshire to the north-east, Essex to the east, Greater London to the ...

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. A prominent local landmark, it is located between

Welwyn Garden City Welwyn Garden City ( ) is a town in Hertfordshire, England, north of London. It was the second Garden city movement, garden city in England (founded 1920) and one of the first New towns in the United Kingdom, new towns (designated 1948). It is ...

and Digswell. It is just to the south of Welwyn North railway station. The viaduct, of 40 arches, is a Grade II* listed structure. It was the longest and tallest viaduct on the Great Northern Railway's route. The viaduct is around long and comprises forty arches of span, and it is high from ground level to trackbed. It is built of red brick fired from clay quarried on site during construction, and took two years to build, including the construction of embankments at both ends which required the movement of around one million tons of earth by human and horse power. It was designed by William Cubitt and styled after a Roman aqueduct. It has been claimed that it was officially opened by

Queen Victoria Victoria (Alexandrina Victoria; 24 May 1819 – 22 January 1901) was Queen of the United Kingdom of Great Britain and Ireland from 20 June 1837 until Death and state funeral of Queen Victoria, her death in January 1901. Her reign of 63 year ...

on 6 August 1850, but she was reportedly so frightened of its height that she refused to travel across it and left the train, using a horse-drawn carriage to travel the length of the bridge on the ground. However, her published diaries for that day show that she was staying at Osborne House on the Isle of Wight at the time. The viaduct carries the East Coast Main Line, which has to narrow from four tracks to two to cross the viaduct, making it a

bottleneck Bottleneck may refer to: * the narrowed portion (neck) of a bottle Science and technology * Bottleneck (engineering), where the performance of an entire system is limited by a single component * Bottleneck (network), in a communication network * ...

restraining capacity over this strategic transport route. This problem is exacerbated by Welwyn North railway station situated at the northern end of the viaduct, which blocks the line while trains are stationary, and by two tunnels to the north. Several ideas to overcome the limitations of the viaduct and station without damaging the viaduct's essential historic character and rhythmic design are periodically discussed. A three-year project in the mid 1930s encased the viaduct's deteriorating brickwork in the blue engineering brick seen today. Overhead lines were added when the line was electrified in the 1970s.

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Railway viaducts in Hertfordshire Buildings and structures in Welwyn Hatfield (district) Grade II* listed buildings in Hertfordshire East Coast Main Line Grade II* listed bridges in England {{Hertfordshire-geo-stub