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Rail lengths
The rails used in rail transport are produced in sections of fixed length. Rail lengths are made as long as possible, as the joints between rails are a source of weakness. Throughout the history of rail production, lengths have increased as manufacturing processes have improved.
==Timeline==
The following are lengths of single sections produced by steel mills, without any thermite welding. Shorter rails may be welded with flashbutt welding, but the following rail lengths are unwelded.
* (1825) Stockton and Darlington Railway - See: S&DR
* (1830) Liverpool and Manchester Railway
*
* fish-belly rails at , laid mostly on stone blocks.
* (1880) United States to suit long gondola waggons
* (1950) British Rail
* (1953) Australia 〔 〕
* (1900) - steel works weighing machine for rails (Steelyard balance)〔 〕
* (1940s) US
Welding of rails into longer lengths was first introduced around 1893, making train rides quieter and safer.〔
* (1895) Hans Goldschmidt developed Thermit welding〔(【引用サイトリンク】url=http://history.evonik.com/sites/geschichte/en/inventions/thermit/pages/default.aspx )〕
* (1935) Charles Cadwell, non-ferrous Thermit welding
* (1950) welded - (4 x ) 〔 〕
Modern production techniques allowed the production of longer unwelded segments.
* (2011) Voestalpine
* (2011) Jindal〔(【引用サイトリンク】url=http://www.jindalsteelpower.com/products/rail.html )〕
* (2013) Tata Steel Europe
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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