Running trajectory optimization to mitigate delay propagation in highly frequent train service based on continuous train position acquisition

In a highly frequent urban train service, mitigation of delay propagation due to excessive dwell time is significant. The aim of this paper is to present a speed control method to minimize the interval between departure and arrival at a station under the uncertainty of the departure time of the preceding train. The optimal trajectory of the following train is through the approach point after the departure of the preceding train and the optimal stopping position before it. We evaluate the performance by assuming communication-based continuous realtime train position acquisition and moving block system except for station sections. The approach mitigates delay propagation without the prediction of departure time.