1857-1967 Crumlin Viaduct over Ebbw River and Crumlin, Wales, UK

(Satellite?, it was over the town of Crumlin and the Ebbw River. Sources said the stone abutments were kept and are visible, but none of them specified where they are. If you find them, please leave a comment.)

ExploringGB, this is one of several photos on this webpage.
It opened in 1857 and was dismantled in 1966. 
"The viaduct was 200 foot [61m] high and ran across the valley for 1650 feet [503m]."

Britain's Photography posted

Crumlin Viaduct in Wales was the tallest railway viaduct in the UK.

The astonishing feat of Victorian engineering was called "one of the most significant examples of technological achievement during the Industrial Revolution.

Neil Morgan commented on the above post
In All Its Glory

James Dawson commented on the above post
You can still see a fine example of this type of engineering in the UK at Bennerley Viaduct, on the Derbyshire/Nottinghamshire Border.

lindahall, Image source: Humber, William. A Practical Treatise on Cast and Wrought Iron Bridges and Girders, as Applied to Railway Structures, and to Buildings Generally. London: E. & F. N. Spon, 1857, frontispiece.
"The Crumlin viaduct is carried by cast iron column members, which support Warren truss girders made of wrought iron."

Exploring GB

Crumlin Viaduct in Wales was the tallest railway viaduct in the UK.

The astonishing feat of Victorian engineering was hailed as 'one of the most significant examples of technological achievement during the Industrial Revolution,' read more 👇

https://www.exploringgb.co.uk/blog/crumlin-viaduct-wales...

ForgottenRelics
Crumlin Viaduct Handbook, which has a lot of detail about the viaduct.
[After reading just a few sentences, I wondered if this handbook was written in the 1800s. Then I read that it was written in 1860.]

OutOfTheBlueArtifacts, this webpage has a lot of information about the viaduct.

caerphilly
"During 109 years of service, it remained the least expensive bridge for its size ever constructed, the highest railway viaduct in the British Isles and third highest in the world, outdone only by the Aqueduct of Spoleto in Italy and the Portage Timber Viaduct in the United States."
"The completed viaduct was tested in the presence of Colonel Wynne, the Board of Trade Inspector in May 1857, four years after construction began. Six locomotives loaded with pig iron or lead and weighing a total of 380 tons, were run onto just one span of the bridge. When both lines of rails were used, the locomotives were the correct size to cover this span and were driven across at various speeds whilst measurements of deflection were taken."
"In 1962, Crumlin Viaduct was scheduled as being of architectural and historical interest by the Ministry of Housing and Local Government. However, by 1964, this decision had been overruled by British Railways, who argued that demolition was the most sensible course of action, partly because the viaduct required regular maintenance even after the line had closed and partly because the structure was thought to be unsound and dangerous."