The Digswell Viaduct, also called Welwyn Viaduct, is a railway viaduct that carries the

East Coast Main Line The East Coast Main Line (ECML) is a electrified railway between London and Edinburgh via Peterborough, Doncaster, York, Darlington, Durham and Newcastle. The line is a key transport artery on the eastern side of Great Britain running b ...

over the River Mimram in the

county A county is a geographic region of a country used for administrative or other purposes Chambers Dictionary, L. Brookes (ed.), 2005, Chambers Harrap Publishers Ltd, Edinburgh in certain modern nations. The term is derived from the Old French ...

Hertfordshire Hertfordshire ( or ; often abbreviated Herts) is one of the home counties in southern England. It borders Bedfordshire and Cambridgeshire to the north, Essex to the east, Greater London to the south, and Buckinghamshire to the west. For gov ...

England England is a country that is part of the United Kingdom. It shares land borders with Wales to its west and Scotland to its north. The Irish Sea lies northwest and the Celtic Sea to the southwest. It is separated from continental Europe ...

. 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 in England (founded 1920) and one of the first new towns (designated 1948). It is unique in being both a garden city and a new town and ...

and

Digswell Digswell is an ancient village and former parish in the English county of Hertfordshire which is recorded in the 1086 Domesday Book. The population of the urban area of Digswell in the 2011 Census was 1,632. Digswell's name may be derived from D ...

. It is just to the south of

Welwyn North railway station Welwyn North railway station serves the villages of Digswell and Welwyn in Hertfordshire, England. The station is located north of London King's Cross, on the East Coast Main Line. Train services are currently provided by Thameslink. Locat ...

. 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 Sir William Cubitt FRS (bapt. 9 October 1785 – 13 October 1861) was an eminent English civil engineer and millwright. Born in Norfolk, England, he was employed in many of the great engineering undertakings of his time. He invented a type o ...

and styled after a

Roman aqueduct The Romans constructed aqueducts throughout their Republic and later Empire, to bring water from outside sources into cities and towns. Aqueduct water supplied public baths, latrines, fountains, and private households; it also supported min ...

. 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 her death in 1901. Her reign of 63 years and 216 days was longer than that of any previ ...

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 Osborne House is a former royal residence in East Cowes, Isle of Wight, United Kingdom. The house was built between 1845 and 1851 for Queen Victoria and Prince Albert as a summer home and rural retreat. Albert designed the house himself, in ...

on the Isle of Wight at the time. The viaduct carries the

, which has to narrow from four tracks to two to cross the viaduct, making it a

bottleneck Bottleneck literally refers to the narrowed portion (neck) of a bottle near its opening, which limit the rate of outflow, and may describe any object of a similar shape. The literal neck of a bottle was originally used to play what is now known as ...

restraining capacity over this strategic transport route. This problem is exacerbated by

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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Short History
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