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Developments in manufacturing technologies has led to changes to the design, manufacture and installation of rails, sleepers and the means of attachments. Cast iron rails, 4 feet (1.2 m) long, began to be used in the 1790s and by 1820, 15-foot-long (4.6 m) wrought iron rails were in use.
Wrought iron. Wrought iron is an iron alloy with a very low carbon content (less than 0.05%) in contrast to that of cast iron (2.1% to 4.5%). It is a semi-fused mass of iron with fibrous slag inclusions (up to 2% by weight), which give it a wood-like "grain" that is visible when it is etched, rusted, or bent to failure.
The Bollman Truss Railroad Bridgeacross the Little Patuxent Riverat Savage, Maryland, is one of the oldest standing iron railroad bridges in the United States and the sole surviving example of a revolutionary design in the history of American bridge engineering.[5] The 160-foot (48.8 m) double-span was built in 1852 at an unknown location on ...
77001511. Added to NRHP. August 29, 1977. Location. The Kinzua Bridge or the Kinzua Viaduct ( / ˈkɪnzuː /, [ 2] /- zuːə /) was a railroad trestle that spanned Kinzua Creek in McKean County in the U.S. state of Pennsylvania. The bridge was 301 feet (92 m) tall and 2,052 feet (625 m) long. Most of its structure collapsed during a tornado in ...
Cast-iron architecture. A street in SoHo in New York City famous for its cast-iron facades. Spa Colonnade in Mariánské Lázně, 1889. Nearly every element is cast iron. Cast-iron architecture is the use of cast iron in buildings and objects, ranging from bridges and markets to warehouses, balconies and fences.
The Wrought Iron Bridge Company was a bridge fabrication and construction company based in Canton, Ohio, United States. It specialized in the fabrication of iron truss bridges and was a prolific bridge builder in the late 19th century. It was one of the 28 firms consolidated by J. P. Morgan into the American Bridge Company in 1900. [1]
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