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The alignment modifications after completion of railway construction entail a lot of efforts and time as well as high additional costs. In the process of renewal of the existing railway alignment to offer higher-speed services, the effect of initial design parameters(e.g., intersection angle) on determination of allowable degree of improvement of horizontal curves under consideration of economic efficiency is investigated in this study. From theanalysis results, in the case that there are obstacles at the tangent line, it was found that the larger angle of intersectionhas a significant effect on the permissible zone. In addition, as the intersection angle is increased, the permissible values of maximum curve radius and the length of transition curve becomes smaller and longer, respectively. It is expected that this study can contribute to the efficient and accurate prediction of the permissible zone according tothe locations of obstacles and the size of intersection angle as well as improvement in the railway alignment withoutany additional costs.

The effects of Design Initial Condition on Renewal of Railway Existing Curves