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track geometry
Track geometry is three-dimensional geometry of track layouts and associated measurements used in design, construction and maintenance of railroad tracks. The subject is used in the context of standards, speed limits and other regulations in the areas of track gauge, alignment, elevation, curvature and track surface.〔(【引用サイトリンク】url=http://www.fra.dot.gov/downloads/PubAffairs/Track_Standards_fact_sheet_FINAL.pdf )〕 Although, the geometry of the tracks is three-dimensional by nature, the standards are usually expressed in two separate layouts for horizontal and vertical.
==Layout==
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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