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track renewal train
A track renewal train (also known as track renewal system) is a work train that consists of many units of machinery and materials required for track renewal (rail and sleeper replacement) projects.
==Rail preparation==
To minimize the down time of track during a track renewal project, a track renewal train is used to automate most of the required process. Prior to the arrival of the track renewal train, preparation tasks must be completed. In some cases, the old rail needs to be cut into smaller segments and joined with fishplates. The rail fastening system may need to be released prior to its arrival.〔(【引用サイトリンク】url=http://www.plasseramerican.com/en/p_renewal/ru800s.htm )〕
The new rails usually need to be prepared prior to the arrival of track renewal train. Rails are delivered to the center of the track. Those rail pieces are welded by track worker to form continuous welded rail (CWR) and left at the center of the track at the exact position required by the track renewal train to pick up at its arrival.〔(【引用サイトリンク】url=http://www.idothsr.org/media_center/ )〕
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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