Precisely survey for ballastless track in the passenger dedicated railway line
peng yi-pu1; xu xi2; yang wen-ya3(1.school of civil and architectural engineering; central south university; changsha 410075; china; 2.school of civil engineering; hunan university; changsha 410082; china; 3.hunan brigade of geological surveying center for chinese building material industry; zhuzhou 412000; china)
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