Discussion on Prospects in elongation of railway transition curves

The paper under discussion presents an elongation of existing transition curves during track renewal to improve allowable train speed and ride comfort. Horizontal arcs or alignments have been re-designed to enable longer and smoother track cant transition (or superelevation transition). This will effectively reduce track twist during the transition. However, it should be further noted that the consideration should also embrace system thinking approach whether it is a semi-green or brown field project. Lifecycle evaluation should be a key concern for track designers whether the transition elongation is suitable.