Theory And Method Of Train Line Planning Of Networked Passenger Dedicated Lines

Train Line Planning (TLP) means the planning of operation section, number and classes for passenger trains. Its formulation and optimization is a very important issue in the railway passenger transport. It involves reasonably utilizing existing fixed equipment and mobile facilities as well as meeting the passenger’s demand for traveling to the largest extent. This belongs to the strategy and planning problem at the intermediate level in the organization of railway transport. In particular, the formulation and optimization of the Passenger Dedicated Lines (PDL) has become an urgent practical problem to be addressed while our government has already listed the construction of the PDL as the key national development strategy plan, high-speed passenger line has been under large-scale construction as well as part of the PDL has been in operation.The Train Line Planning of the Networked Passenger Dedicated Lines is a holistic and systematic transport service network design, covering departure and arrival stations, stop stations, traveling routes, train classes, marshalling, service facilities, operating frequency, link and coordination, etc. It involves a number of relevant variables and has complex model structures.The specific studies are as follows:(1) Analysis of PDL transportation organization modesThe paper studies the situation of transportation organization mode of high-speed rail or PDL based on railway network topology abroad, and compares and analyzes the linear structure of Taiwan High Speed Rail, the tree-like network of France and Japan as well as the mesh structure of Germany. The paper proposes three modes suitable for China’s networked PDL transportation organization, namely:off-line mode, on-line mode and transfer mode. Furthermore, the paper conducts a qualitative analysis of the factors affecting the choice of the transportation organization modes. Then, the paper proposes to adopt differentiated transportation organization modes catering to various types of PDL.(2) Analysis of demand for passenger transport of PDLFrom a macro perspective, the paper discusses the general characteristics of China’s railway passenger transport market:large market volume, dispersed passenger flow direction, higher cross-line passenger flow, etc. The paper conducts statistics and analysis of the passenger exchange data between the major passenger transport nodes on the whole railway passenger flow, and summarizes the morphological characteristics of the PDL passenger flow, factors resulting in the changes in passenger flow as well as the temporal and spatial distribution of passenger flow. The results show that there is a certain imbalance in the distribution of passenger flow of the Passenger Lines both in time and space. This paper studies the relationship between passenger and traffic organization, and proposes that PDL organization must adhere to the principles of railway network integrity, product diversity, beat-type transport and convenient transfer.(3) Multi-objective optimization model of Train Line Planning of PDLBy means of studying the characteristics of train line planning of PDL, the paper analyzes the related costs of passenger trains. From the interests of both railway transport enterprises and passengers, the paper establishes a multi-objective optimization model for passenger train line planning. The paper designs a genetic algorithm resulting from the passenger train line planning based on the random stop-pattern, and the attendance rate of the train is set as the optimization direction of the passenger volume assignment between stations. Through the process of "stops plan creation-passenger flow assignment-function value calculation-stop plans adjustment" to implement the iterative calculation, the paper completes the solution of the multi-objective optimization model of train line planning of PDL. The academic research has already been successfully applied in the formation and optimization of train line planning of Wuhan-Guangzhou Passenger Dedicated Lines supported by the Ministry of Railway.(4) Research on stop schedule of train line planningStop schedule is an important problem to be addressed while determining the high-speed railway train line planning. Based on the established multi-objective optimization model under random stop-pattern for TLP, the paper sets up an optimal mathematics model under a given set of stop-schedules. Drawing on the actual stop experience of various levels of trains running in the traditional rail line, this paper introduces the concept of the importance of nodes, and makes a calculation of it by analyzing the economic and social attributes as well as railway resource allocation of the PDL covered nodes. On the basis of the grey incidence decision and analytical hierarchy process (AHP), the paper studies the quantitative index of the nodes transport distribution capacity in the PDL network and calculates the evaluation indexes of importance of those city nodes. Thus, in the light of the assessment results, the paper sets up the three-level hierarchy in the importance of city nodes covered by the PDL. Through matching the three kinds of train’s stop-pattern, namely direct, skip-stop, all-stop, to the passenger flow volume and attributes of flow direction, the paper solves the train line planning’s optimization under a given set of stop-schedule. This method has been applied in the PDL train line planning of Wuhan-GuangZhou High-Speed Railway Line and proved to be effective in reducing the complexity of the train line planning problem according to different modes of passenger flow.(5) Model and algorithm of PDL train’s transport service network designWith an in-depth analysis of the selection behavior of cross-line passenger flow, the paper sets up a multi-route selection model according to the two types of cross-line passenger behavior, namely taking direct train and transferring at intermediate node. Based on the established multi-objective optimization model of train line planning and the general principles and methods of transport service network design, the paper discretizes the passenger flow, and sets up the cross-line train service network design model with the minimum total cost of the whole system in light of various properties of the arc section of the train route. Furthermore, the paper designs a heuristic algorithm based on the genetic algorithm (GA). The paper constructs an empirical case of the transport service network design of the train line planning between the first-level nodes i under railway network, and further analyzes and explores the promotion of the model in the whole network.The massive construction and continuous operation of the passenger dedicated lines (PDL) has remarkable practical significance in accelerating China’s urbanization and modernization, promoting the coordinated and optimized development of urban and rural areas. The rapid progress of engineering practice requires the strong support of theoretical innovation and technology integration. The formulation and optimization of networked PDL train line planning also has great significance in promoting the theoretical development of railway passenger transport organization as well as the theoretical and technological development of urban rail transport organization and integrated traffic system.