Abstract
In order to raise running speed of trains in existing line, speed should be raised when passing curved section and transition curved section in existing line by suggesting practical standard for max running speed in each section, where running safety is considered. In order to raise speed of train in existing line, that passes curved section of high risk of derailment, this study examined the effect to running safety when train passes each curved section in both lanes between Yeonsinnae and Gupabal, which is real railway of Line 3. Analysis of running safety was implemented as making running speed for each radius of curvature higher than actual track condition.
