• Research on Signal System Scheme for Integration of Four Networks
• Liu Mingyuan, Dai Hong
• 2024 Vol. 21 (3): 1-6. DOI:10.3969/j.issn.1673-4440.2024.03.001
• Abstract ( ) PDF (941KB)( )
• The construction of urban rail transit lines, suburban railways, as well as intercity railways is advancing towards networked operation. The interoperability of various rail transport systems has become an unavoidable issue in engineering construction, and the compatibility of signal systems is a basic condition for the interoperability of various rail transport systems. At present, both the CBTC system and the CTCS system occupy a dominant market position in their respective rail transport fields. However, these two train control systems have completely different requirements for civil engineering conditions, resulting in significant differences in such aspects as project scale and functional positioning. This paper discusses the differences between these two train control systems in terms of operational capacity and public transport operation. It also provides a solution in response to the current technical difficulties related to interoperability, which provides a feasible approach for engineering design in the future.
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• Research on Route Search Based on Adjacency List and Improved Depth First Search#br#
• Liu Ruchen, Sun Zhongren, Zhang Shangchong
• 2024 Vol. 21 (3): 7-11. DOI:10.3969/j.issn.1673-4440.2024.03.002
• Abstract ( ) PDF (850KB)( )
• This paper intends to solve the problems of cumbersome modification of station data in the traditional interlocking table structure and low efficiency in route search based on interlocking table, and to improve the convenience of data storage in the interlocking system and the efficiency of station route search. It presents a station model using an adjacency list structure, and on this basis, a new route search model using an improved depth first search algorithm. The proposed station model based on adjacency list can reduce the difficulty of station data maintenance, and improve the efficiency of route search when used together with an improved depth first search algorithm.
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• Design and Implementation of Temporary Speed Restriction Decision Support System for Train Control
• Tong Tong, Xu Wei, Jin Liangbo
• 2024 Vol. 21 (3): 12-17. DOI:10.3969/j.issn.1673-4440.2024.03.003
• Abstract ( ) PDF (1130KB)( )
• Temporary speed restriction is a core function of the train control system for high speed railways. The missing or wrong issuance of Temporary Speed Restriction (TSR) commands may cause great safety hazards. This is especially true for complex lines, where TSR commands may not be issued correctly because the relevant personnel are not familiar with the line information of civil works and signal systems, and the speed restriction rehearsal is dependent on the real operating environment, which affects both operational efficiency and safety. To solve these problems, this paper studies the automatic generation method of TSR parameters based on the speed restriction parameters of the civil works as well as the integrated simulation technology of train control equipment. On this basis, it describes the design and implementation of a TSR decision support system. The proposed system can automatically generate the TSR parameters of the signal system, and provide an independent simulated rehearsal environment. The trial operation results of system deployment show that the proposed system can effectively assist the relevant personnel in efficiently and accurately completing the TSR related operations.
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• Research on Real-time Online Monitoring System for Hump Tail Stopping Devices
• Wu lei, Zhang Feng, Zhu Wen
• 2024 Vol. 21 (3): 18-23. DOI:10.3969/j.issn.1673-4440.2024.03.004
• Abstract ( ) PDF (3239KB)( )
• This paper introduces a system for remotely monitoring the status of hump tail stopping devices, which is developed to implement digital upgrades to the existing stopping devices, improve maintenance efficiency and reduce maintenance intensity. In addition to collecting, analyzing and warning about the daily equipment parameter information, it also innovatively adopts the "profile" detection method, which can more fully and accurately reflect the quality state of the stopping devices. In addition, the elastic features of the brake rail have been cleverly utilized to extract the key information, such as the vehicle entrance speed and vehicle storage representation, which provides an effective means for the tail information feedback of the hump speed regulation system and further improves the comprehensive efficiency of make-up and break-up operations  in marshalling stations.
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• Design and Implementation of Integrated Emergency Communication Network Based on Software Defined Networking(SDN)
• Shuang Jiayun, Luo Tao
• 2024 Vol. 21 (3): 24-28. DOI:10.3969/j.issn.1673-4440.2024.03.005
• Abstract ( ) PDF (1143KB)( )
• The integrated emergency communication network for railways faces big challenges in achieving rapid construction due to its involvement of many services and technologies. One research topic worthy of attention is how to achieve the rapid construction of integrated emergency communication networks, while meeting the different needs of various services and multiple scenarios and ensuring the stability and effectiveness of communication networks. This paper draws the inspiration from the new concept of separation between control layer and data layer in software defined network (SDN), and makes the proposal the SDN technology should be introduced to emergency communication. Thus, SDN-based integrated emergency communication networks can be established to achieve such related functions as centralized network control, state perception and on-demand routing, and improve network stability and efficiency.
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• Research on Vehicle-Ground Communication Technology Based on Public Network for Train Control System of Heavy Haul Railways
• Xie Hehuan
• 2024 Vol. 21 (3): 29-35. DOI:10.3969/j.issn.1673-4440.2024.03.006
• Abstract ( ) PDF (1465KB)( )
• The selection of Vehicle-Ground Communication (VGC) technology is a key issue to be addressed for the train control system of heavy haul railways. This paper provides a comprehensive and in-depth analysis of this issue, and proposes a solution featuring public-network-based VGC technology, which can meet the requirements of the train control system for heavy haul railways. The proposed solution combines the virtual private network technology with the network security technology, and has the characteristics of low cost, high efficiency, easy implementation and full assurance of safe and reliable VGC. It has become the preferred solution for VGC of the train control system for heavy haul railways, and can lay a foundation for the deep intelligence of the train control system for heavy haul railways.
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• Loading and Unloading Time Estimation Based on Xgboost for Railway Freight Transport
• Zhou Jin, Wang Wenbin, Liu Ziyang, Liu Yongzhuang
• 2024 Vol. 21 (3): 36-41. DOI:10.3969/j.issn.1673-4440.2024.03.007
• Abstract ( ) PDF (1143KB)( )
• The traditional method of loading and unloading time prediction of freight transport, which directly utilizes the standard time specified in the Detailed Instructions Governing Train Operation at Station, cannot properly characterize the time change under the impacts of complex factors, and achieves low prediction accuracy. This paper utilizes the data mining method to gather the relevant data on the loading and unloading time of freight transport from the railway integrated dispatching information system. It also utilizes the boosted decision tree model Xgboost to predict the loading and unloading time of freight transport. Compared with the reference model, the proposed model can achieve substantial improvement in prediction accuracy, and provide more effective support for traffic flow prediction and automatic drawing of train operation charts.
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• Research on Cyber-security of Integrated Network Management System for Railway Communication#br#
• Wei Min
• 2024 Vol. 21 (3): 42-46,88. DOI:10.3969/j.issn.1673-4440.2024.03.008
• Abstract ( ) PDF (892KB)( )
• This paper introduces the construction background and cyber-security status of the integrated network management system for railway communication. It also studies and analyzes the cyber-security related provisions on the integrated network management system included in the standards Q/CR 772-2020 Basic Requirements for Classified Protection of Cybersecurity of Railway-General Security Requirements and Q/CR 783.1-2021 Technical Requirements for Cybersecurity of Railway Communication--Part 1: General Technical Specification. Moreover, it provides suggestions on the construction model for the cyber-security of the integrated network management system. Through research on the network security of integrated network management systems, this paper provides reference for effective cyber-security protection of integrated network management systems in the future.
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• Research on Multiple-redundancy Early Warning Technology in Railway Construction Protection System
• Tang Wenguo
• 2024 Vol. 21 (3): 47-53. DOI:10.3969/j.issn.1673-4440.2024.03.009
• Abstract ( ) PDF (1418KB)( )
• In the railway construction process, there are such problems as limited means of train positioning, lack of information exchange and multi-party joint control, and poor effect of personal safety protection. To solve these problems, this paper proposes a railway construction protection system, which builds on high-precision positioning using the Beidou system, and utilizes such technologies as 4G communication and secondary radar communication, to achieve train location tracking and train approach early warning. In terms of train approach early warning, the proposed system utilizes the multiple-redundancy early warning technology, which combines secondary radar projection with Beidou system projection for early warning. The multiple-redundancy early warning technology enables the detection of train approach in the construction area and the subsequent generation of early warning information even when only one early warning mechanism is effective due to such reason as the presence of tunnels, which ensures the reliability of system functions.
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• Research and Design of Information Command Center in Engineering Design Enterprises#br#
• Li Rui
• 2024 Vol. 21 (3): 54-58,,82. DOI:10.3969/j.issn.1673-4440.2024.03.010
• Abstract ( ) PDF (1007KB)( )
• This paper utilizes the idea of cloud-based microservice architecture for enterprises to build a command center system based on "big data, cloud computing, micro-applications and mobile Internet". It also utilizes the idea of middle-office construction to build a business middle office, a data middle office and a technology middle office, as well as various front-end applications based on microservice and cloud computing. Thus, the enterprises’ employees, properties and materials are allocated coordinately during their operation, production and management, and intensive management and refined management are combined harmoniously. The data assets are mined to the maximum, and the data is taken as the basis to analysis problems, support decision-making and predict risks. Thus, the data-based approach is taken to maximize the enterprises’ advantages and guide their innovation-driven development and management.
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• Solution to Improve Wireless Route Notice Transmission by CTC System#br#
• Chen Fan, Tang Baowei
• 2024 Vol. 21 (3): 59-63. DOI:10.3969/j.issn.1673-4440.2024.03.011
• Abstract ( ) PDF (823KB)( )
• If there are trains with the same train number in the CTC system, the wireless route notice may be sent to a wrong train, which will cause confusion to the driver. To solve this problem, this paper proposes a solution to improve the wireless route notice transmission by the CTC system in GSM-R network covered sections. The proposed solution obtains the locomotive or EMU operation plan from the locomotive or EMU dispatching system through the CTC system. Then, it determines the leading locomotive’s locomotive number or the EMU’s train set number after matching with the actually received wireless train number information, to ensure that the CTC system sends the wireless route notice to the correct train. Thus, it can effectively prevent the incorrect transmission of wireless route notice by the CTC system without changing the wireless route notice transmission logic in the CTC system.
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• Reliability Analysis and Comparison of Signaling System Schemes of Train Autonomous Circumambulate System and Communications Based Train Control System
• Li Mei
• 2024 Vol. 21 (3): 64-68. DOI:10.3969/j.issn.1673-4440.2024.03.012
• Abstract ( ) PDF (1114KB)( )
• At present, the communication based train control system (CBTC) has been used as the mainstream signaling system for rail transit, while the train autonomous circumambulate system (TACS) has also been gradually put into operation in China. To compare the reliability level of these two signaling systems, this paper performs a reliability analysis for both the TACS system and the CBTC system from the perspective of fault-caused operation delay. It presents the reliability block diagrams of both the TACS and the CBTC system in which faults lead to delays of more than 2 minutes and more than 5 minutes, which are drawn in view of the design architecture of these two signaling systems and the line configuration. Then, it provides an evaluation and comparison of the reliability level under the two system architectures under discussion. Moreover, it proposes improvement measures, which are intended to provide reference for the development and application of the signaling systems for urban rail transit.
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• Solution for Connecting CBTC System to Existing Line Under Complex Conditions#br#
• Chen Tong
• 2024 Vol. 21 (3): 69-72. DOI:10.3969/j.issn.1673-4440.2024.03.013
• Abstract ( ) PDF (800KB)( )
• With the gradual expansion of subway networks, more and more subway lines are constructed and opened in stages due to such constraining factors as planning, approval and requirement change. How to achieve the full-functional access of the signal system without affecting the normal operation of an existing line is the key issue for the opening of the subway line. Based on the implementation experience accumulated in the signal system engineering project for the northern section of Phase II of Dalian Metro Line 2, this paper proposes a system access plan for the CBTC system under complex conditions. The proposed plan can reduce both the safety risks and the commissioning time, and provide reference and practical experience for similar projects.
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• Research on Integrated Ticketing Service
• Li Daming, Huang Zhiwei, Chen Kehang
• 2024 Vol. 21 (3): 73-76. DOI:10.3969/j.issn.1673-4440.2024.03.014
• Abstract ( ) PDF (994KB)( )
• This paper first analyzes the necessity of building an integrated ticketing system for achieving the interoperability between the ticketing systems of new-type rail transit line and surrounding tourist attractions. It then briefly introduces the ticketing systems of new-type rail transit line and tourist attractions. It finally introduces a travel scheme featuring integrated ticketing from three aspects, i.e. system architecture, system functions and integrated travel process.
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• Research on Measurement Method of Odometer
• Li Xiaopeng, Wang Yu, Xue Chao, Liu Ming
• 2024 Vol. 21 (3): 77-82. DOI:10.3969/j.issn.1673-4440.2024.03.015
• Abstract ( ) PDF (1624KB)( )
• To meet the requirements for automated testing during equipment maintenance for odometers in urban rail transit, this paper first compares different measurement methods of odometers, and then proposes a quick measurement method of odometers that is suitable for field maintenance. It also makes the proposal that, to improve the accuracy of the test results of odometers, statistical analysis of their dynamic performance indicators should be performed, rather than testing and analysis of their static performance indicators. The proposed quick measurement method of odometers has been verified through prototype testing and put into practical application, and has produced good application results.
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• Solution for Barrier-free Fast Ticket Checking System for Rail Transit
• Gan Lu, Zhang Zheng
• 2024 Vol. 21 (3): 83-88. DOI:10.3969/j.issn.1673-4440.2024.03.016
• Abstract ( ) PDF (1159KB)( )
• Rail transit is becoming the first choice for passengers thanks to its features of fast speed, punctuality and large capacity. With the continuous increase of passengers, more ticket gates are needed for their entry and exit at the station. However, due to the restraint of the civil construction conditions at the station, it is not possible to add ticket gates on a large scale. This paper studies the technical characteristics of Radio Frequency Identification(RFID), and considers the construction situation of automatic fare collection systems in rail transit. On this basis, it proposes a solution for barrier-free fast ticket checking system in stations based on the RFID and face recognition technologies. The proposed solution can achieve "senseless" entry and exit of subway passengers at the station, by allowing them to enter and leave the station without using the travel card, which improves the quality of passenger service.
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• Discussion of Key Aspects of Factory Prefabrication Technology in Signal Equipment Room Construction
• Liu Jiaxin
• 2024 Vol. 21 (3): 89-94. DOI:10.3969/j.issn.1673-4440.2024.03.017
• Abstract ( ) PDF (8990KB)( )
• Signal equipment room construction involves a significant amount of cable laying and welding, and often faces such challenges as tight timeline, labor shortage, limited resources and poor construction environment in the case of retrofitting projects of existing lines, and projects in overseas markets and harsh environments. This paper analyzes the constraining factors in signal equipment room construction, and provides a visual comparison between the traditional construction method and the factory fabrication method to introduce the key technical aspects of the factory prefabrication technology in signal equipment room construction. The factory prefabrication technology for signal equipment room construction adjusts the equipment layout and wiring nodes, modifies the wiring method of cabinet equipment without changing the existing interlocking relationships and control circuits. Thus, it allows standardized production at the factory with cabinet as the basic unit, as well as inter-cabinet construction at the construction site featuring bundling and plug-and-play. The proposed factory fabrication method, which features modularization, standardization, plug-and-play and bundling, can greatly simplifies the on-site wiring and debugging work, and effectively reduce the on-site construction time, to ensure construction safety at low construction costs.
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• Analysis and Countermeasures of Relay Protection Problems of Traction Power Supply Feeder
• Zhang Yixiang, Wu Ji
• 2024 Vol. 21 (3): 95-100. DOI:10.3969/j.issn.1673-4440.2024.03.018
• Abstract ( ) PDF (889KB)( )
• This paper focuses on a case of missed action of microcomputer protection for traction power supply under fault conditions. It conducts an in-depth study on the causes of missed action through analysis of locomotive protection and microcomputer protection from multiple angles and for the whole system. It analyzes the vehicle mechanism, the catenary, the fixed values of traction protection, the matching logic of fixed values, and the operation situation of primary and secondary equipment, through such methods as calculation, logical deduction and simulation testing. On this basis, it identifies the causes of missed action through analysis, and corrects the existing problems in operation. Moreover, it provides theoretical support for operation and maintenance in the future.
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• Fault Analysis of Logic Check at Junction of 25 Hz Phase Sensitive Track Circuit and ZPW-2000A Track Circuit
• Jia Hong, Ma Ying, Zhang Qi
• 2024 Vol. 21 (3): 101-105. DOI:10.3969/j.issn.1673-4440.2024.03.019
• Abstract ( ) PDF (884KB)( )
• The 25 Hz phase sensitive track circuit has different characteristics from ZPW-2000A track circuit. However, during the retrofitting of automatic block and station coding systems, these two track circuits are often used together. The different characteristics of these two track circuits may lead to the failure of logic check at their junction. This paper analyzes the failure of normal release of the yard connection route and the loss of shunting kept in the third approach block section, and introduces the scenario and causes of these faults. It also discusses the solutions of the interlocking system, train control center system, integrated section monitoring system and relay logic check circuit for these failures, which provides reference for engineering design and fault handling in the future.
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• Intelligent Centralized Control System for Early Warning of Railway Level Crossings
• Zhou Shuai, Zhou Pei, Wu Hengjie, Zhou Lingyu
• 2024 Vol. 21 (3): 106-112. DOI:10.3969/j.issn.1673-4440.2024.03.020
• Abstract ( ) PDF (3124KB)( )
• The traditional safety protection measures for railway crossings can no longer meet the current development needs due to their low efficiency, high cost and potential safety hazards. To meet this challenge, this paper proposes an innovative intelligent centralized control system based on wireless communication for early warning of railway crossings, which aims to guarantee the life and property safety of the staff and traffic participants at railway crossings. The LoRa long-range radio-frequency communication technology, OpenMV-based vehicle and pedestrian target recognition technology and computer based interlocking technology are combined to design a low-power, easy-to-deploy remote centralized management system for unattended railway crossings, which can improve the efficiency of railway operation, and enhance the safety of railway transport.
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