Abstract
To meet the increasing demand for improving railway service quality while using the precious mobile resources reasonably and economically, this research proposes a hierarchical approach that integrates the model for constructing an efficient electric motor train unit circulation plan into the model for optimized timetable design without predefining timetable details. A simulated annealing algorithm for solving the timetabling (main) model is designed, in which the neighborhood system is pretreated. A special tree construction–based branch-and-bound algorithm is improved for solving the electric motor train unit circulation planning (sub)model. The results of the numerical experiment verify the effectiveness of the proposed method. Specifically, compared to the randomly generated initial solution, the optimal solution obtained by the proposed methods reduces the total travel time by 686 min and reduces the number of electric motor train units by 5. The number of electric motor train units needed by the proposed method is on average at least two less than the method that handles the problem in a sequential way. Railway operators can implement this approach for balancing the efficiency of timetable and the quality of electric motor train unit circulation plan within a reasonable computation time when scheduling trains in railways.
Highlights
Train timetable and electric motor train unit (EMU) circulation plan are among the most important plans in the operation of high-speed railway systems
A hierarchical framework is proposed for the coordinate optimization of train timetable and EMU circulation plan
The framework integrates the problem of timetabling and EMU circulation planning and consists of a main model and a submodel
Summary
Train timetable and electric motor train unit (EMU) circulation plan are among the most important plans in the operation of high-speed railway systems. The proposed hierarchical approach integrates the construction of an efficient EMU circulation plan into the optimized design of the timetable under the condition that the timetable details (all departure and arrival times, train order, the stations for overtaking operations, etc.) are not predefined.
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