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- Carnon_viaduct abstract "Carnon viaduct carries the railway from Truro to Falmouth (now branded the 'Maritime Line') over the valley of the Carnon River in west Cornwall, United Kingdom. The viaduct is situated half-a-mile (800 metres) northeast of Perranwell station which is five miles (8 km) from the line's terminus at Falmouth and three miles (5 km) from its junction with the Cornish main line at Truro.The present nine-arch masonry viaduct replaces an earlier structure designed by Isambard Kingdom Brunel for the Cornwall Railway. The original viaduct was opened to traffic when the line was extended from Truro to Falmouth in 1863 and had a timber deck supported by timber trestles springing from eleven masonry piers. It was 756 feet (230 m) long and 96 feet (29 m) high.The present viaduct is of roughly the same dimensions as the original. It was built by the Great Western Railway as an entirely new structure immediately south of its predecessor and it cost £40,000. It has nine arches and opened to traffic in June 1933. The timberwork of the original structure was dismantled and removed but its masonry piers still stand beside the replacement viaduct (see photo).Construction of the original structure posed specific problems not encountered at the sites of other viaducts in Cornwall. The tidal limit of Restronguet Creek extended further up the Carnon River valley than it does today and at the site of the viaduct the valley floor then consisted of intertidal mudflats and a great quantity of silt washed down from the numerous mines upstream. This soft layer was over 20 feet (6.1 m) thick and "...not an ideal foundation for a 96ft high viaduct."After exploratory drillings, the engineering contractors sunk cast iron caissons through the silt to the bedrock at each pier location. The cylindrical caissons, 16 feet (4.9 m) in diameter, were then emptied of silt so that masonry footings could be built from the rock up to surface level, pumps being employed to keep the workings dry. This added to the cost of construction but proved entirely satisfactory as Carnon was among the last of the original Cornwall railway viaducts to be replaced.".
- Carnon_viaduct thumbnail Carnon_Viaduct.jpg?width=300.
- Carnon_viaduct wikiPageID "27587448".
- Carnon_viaduct wikiPageRevisionID "569978312".
- Carnon_viaduct hasPhotoCollection Carnon_viaduct.
- Carnon_viaduct subject Category:Bridges_in_Cornwall.
- Carnon_viaduct subject Category:Bridges_of_Isambard_Kingdom_Brunel.
- Carnon_viaduct subject Category:Rail_transport_in_Cornwall.
- Carnon_viaduct subject Category:Railway_bridges_in_England.
- Carnon_viaduct subject Category:Viaducts_in_England.
- Carnon_viaduct point "50.22343 -5.10619".
- Carnon_viaduct type Artifact100021939.
- Carnon_viaduct type Bridge102898711.
- Carnon_viaduct type BridgesInCornwall.
- Carnon_viaduct type Object100002684.
- Carnon_viaduct type PhysicalEntity100001930.
- Carnon_viaduct type Structure104341686.
- Carnon_viaduct type Viaduct104532670.
- Carnon_viaduct type ViaductsInTheUnitedKingdom.
- Carnon_viaduct type Whole100003553.
- Carnon_viaduct type YagoGeoEntity.
- Carnon_viaduct type YagoPermanentlyLocatedEntity.
- Carnon_viaduct type SpatialThing.
- Carnon_viaduct comment "Carnon viaduct carries the railway from Truro to Falmouth (now branded the 'Maritime Line') over the valley of the Carnon River in west Cornwall, United Kingdom.".
- Carnon_viaduct label "Carnon viaduct".
- Carnon_viaduct sameAs m.0c3__s8.
- Carnon_viaduct sameAs Q5044159.
- Carnon_viaduct sameAs Q5044159.
- Carnon_viaduct sameAs Carnon_viaduct.
- Carnon_viaduct lat "50.22343".
- Carnon_viaduct long "-5.10619".
- Carnon_viaduct wasDerivedFrom Carnon_viaduct?oldid=569978312.
- Carnon_viaduct depiction Carnon_Viaduct.jpg.
- Carnon_viaduct isPrimaryTopicOf Carnon_viaduct.