The distance between track centers is determined by a passing speed of a train and cant, which are key factors for the size of cross section in tunnels. Also, the application methods of the distance between track centers can cause the increase of maintenance cost in the long term as well as the increase of construction cost because they influence the size of cross section for tunnel excavation.
In this study, the author evaluates the variation of construction cost with displaying tunnel cross sections by passing speeds using the Train Performance Simulation (TPS), whereas customary practice is to decide the size of cross section with consideration for balance cant on a curve. Moreover, the author analyses interference in the system interfaces like tracks and systems.
In conclusion, the author finds out that the rates of alignment improvement and cost reduction by changing the size of cross sections reach up to 4.48%~7.3%, respectively, when the correction of cant is applied. The benefit of cost reduction can be multiplied in case of applying this study to the entire section of the Gimpo urban railway project.