Research purposes: Based on the comprehensive considerations of the design track capacity，traffic organization，speed—increasing effect，land usage，interference to the other existing lines and engineering investment，the analyses of the upgrading schemes of existing railway line ale made for deciding the final upgrading scheme．
Research conclusions: From the comparison and analysis of the previous upgrading schemes of some existing railway lines，such as reconstruction of single track，additional construction of the second line with partial upgrading of the existing line，construction of double track step by step and construction of double track by one time，it is concluded construction of double track by one time has features of saving construction cost，getting good economic benefits，high traffic quality，less interference to the other existing railway lines，and provding the wide space for further economic development and railway network construction．So the scheme of construction double track by one time should be adopted for upgrading of existing line．
PDF(371 KB)
