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2. Crumlin Viaduct - Wikipedia

   en.wikipedia.org/wiki/Crumlin_Viaduct

   Construction cost: £62,000 (£41 7s per foot) [1] (£6.262m at 2014 prices) [2 ... Here castings from Falkirk were brought together with wrought iron from Blaenavon ...

3. Wrought iron - Wikipedia

   en.wikipedia.org/wiki/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.

4. Rail profile - Wikipedia

   en.wikipedia.org/wiki/Rail_profile

   Weights are measured in pounds per yard (imperial units in Canada, the United Kingdom and United States) and kilograms per metre in mainland Europe and Australia). 1 kg/m = 2.0159 lb/yd. Commonly, in rail terminology pound is a metonym for the expression pounds per yard and hence a 132–pound rail means a rail of 132 pounds per yard.

5. Kansas and Missouri Bridge - Wikipedia

   en.wikipedia.org/wiki/Kansas_and_Missouri_Bridge

   The bridge was a Post through truss [2] constructed of two types of iron. The truss used 2,093,900 pounds (949,800 kg) of wrought iron and 700,417 pounds (317,704 kg) of cast iron. The truss was configured with three spans. The western and center span were both 340 feet (100 m), and the eastern span was 314 feet (96 m).

6. Structural material - Wikipedia

   en.wikipedia.org/wiki/Structural_material

   Wrought iron is the simplest form of iron, and is almost pure iron (typically less than 0.15% carbon). It usually contains some slag. Its uses are almost entirely obsolete, and it is no longer commercially produced. Wrought iron is very poor in fires. It is ductile, malleable and tough. It does not corrode as easily as steel.

7. Railway track - Wikipedia

   en.wikipedia.org/wiki/Railway_track

   Heavier rail can support greater axle loads and higher train speeds without sustaining damage than lighter rail, but at a greater cost. In North America and the United Kingdom, rail is graded in pounds per yard (usually shown as pound or lb), so 130-pound rail would weigh 130 lb/yd (64 kg/m). The usual range is 115 to 141 lb/yd (57 to 70 kg/m).