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This Stage is part of the sequential development of the Tyne and Wear Metro. The Basis of this process is the Conception of formation of the Developed network of the Tyne and Wear Metro: http://commons.wikimedia.org/wiki/File:The_Tyne_and_Wear_Metro_Development_Conception_-_July,_2011_(by_Gleb_K.Samoilov).jpg http://commons.wikimedia.org/wiki/File:The_Northumberland_-_Tyne_and_Wear_-_Durham_Metro_(as_the_result_of_the_Tyne_and_Wear_Metro_Development)._The_Geographically_accurate_position_of_lanes.jpg http://www.skyscrapercity.com/showthread.php?p=82175232 This process consists of eight stages: http://trainclub.ru/view_blog/perspektivy_razvitiya_seti_tyne_wear_metro_velikobritaniya/ http://www.amazines.com/article_detail.cfm?articleid=3328638 http://www.skyscrapercity.com/showthread.php?t=402998&page=88 http://commons.wikimedia.org/wiki/File:The_First_stage_of_the_Tyne_and_Wear_Metro_Development.jpg http://commons.wikimedia.org/wiki/File:The_Second_stage_of_the_Tyne_and_Wear_Metro_Development.jpg http://commons.wikimedia.org/wiki/File:The_Third_stage_of_the_Tyne_and_Wear_Metro_Development.jpg http://commons.wikimedia.org/wiki/File:The_Fourth_stage_of_the_Tyne_and_Wear_Metro_Development.jpg http://commons.wikimedia.org/wiki/File:The_Fifth_stage_of_the_Tyne_and_Wear_Metro_Development.jpg http://commons.wikimedia.org/wiki/File:The_Sixth_stage_of_the_Tyne_and_Wear_Metro_Development.jpg http://commons.wikimedia.org/wiki/File:The_Seventh_stage_of_the_Tyne_and_Wear_Metro_Development.jpg http://commons.wikimedia.org/wiki/File:The_Eighth_stage_of_the_Tyne_and_Wear_Metro_Development.jpg After completing the bulk of the work on the Eighth stage of the Tyne and Wear Metro Development appropriate to make underground and most of the existing Metro lines. It can be classified as the Ninth stage of Development or the Final part of Eighth stage. In this trace does not change. Underground will be the following sites: AIRPORT – Callerton P