The Wharncliffe Viaduct is a brick-built

viaduct A viaduct is a specific type of bridge that consists of a series of arches, piers or columns supporting a long elevated railway or road. Typically a viaduct connects two points of roughly equal elevation, allowing direct overpass across a wide ...

that carries the

Great Western Main Line The Great Western Main Line (GWML) is a main line railway in England that runs between London Paddington and . It connects to other main lines such as those from Reading to Penzance and Swindon to Swansea. The GWML is presently a part of t ...

railway across the Brent Valley, between

Hanwell Hanwell () is a town in the London Borough of Ealing. It is about west of Ealing Broadway and had a population of 28,768 as of 2011. It is the westernmost location of the London post town. Hanwell is mentioned in the Domesday Book of 1086. St ...

and Southall,

Ealing Ealing () is a district in west London (sub-region), west London, England, west of Charing Cross in the London Borough of Ealing. It is the administrative centre of the borough and is identified as a major metropolitan centre in the London Pl ...

, UK, at an elevation of . The viaduct, built in 1836–7, was constructed for the opening of the

Great Western Railway The Great Western Railway (GWR) was a History of rail transport in Great Britain, British railway company that linked London with the southwest, west and West Midlands (region), West Midlands of England and most of Wales. It was founded in 1833, ...

(GWR). It is situated between Southall and

stations, the latter station being only a very short distance away to the east. The viaduct was the first major structural design by

Isambard Kingdom Brunel Isambard Kingdom Brunel ( ; 9 April 1806 – 15 September 1859) was an English civil engineer and mechanical engineer who is considered "one of the most ingenious and prolific figures in engineering history", "one of the 19th-century engi ...

, the first building contract to be let on the GWR project, and the first major engineering work to be completed. It was also the first railway viaduct to be built with hollow piers, a feature much appreciated by a colony of

bat Bats are flying mammals of the order Chiroptera (). With their forelimbs adapted as wings, they are the only mammals capable of true and sustained flight. Bats are more agile in flight than most birds, flying with their very long spread-out ...

s which has since taken up residence within.

Background

The

was established in 1835 to build a line from London in the east to

Bristol Bristol () is a City status in the United Kingdom, cathedral city, unitary authority area and ceremonial county in South West England, the most populous city in the region. Built around the River Avon, Bristol, River Avon, it is bordered by t ...

in the west. Its chief engineer was

, who personally supervised all major civil engineering works on the route. The River Brent was the first significant obstacle on the route and the Wharncliffe Viaduct was the first major engineering work.

Design

Constructed of engineering brick, the viaduct has eight semi-elliptical arches, each spanning and rising . It is wide. The supporting piers are hollow and tapered, rising to projecting stone cornices that held up the arch

centring Centring, centre, centering"Centering 2, Centring 2" def. 1. Whitney, William Dwight, and Benjamin E. Smith. ''The Century dictionary and cyclopedia''. vol. 2. New York: Century Co., 1901. p. 885., or center is a type of falsework: the temporary s ...

during construction.