The purpose of this paper is to categorize the research on Level 3 and Hybrid Level 3;map how the research focus on ERTMS Level 3 has developed over time;summarize key assumptions in research on Level 3 and Hybrid Lev...The purpose of this paper is to categorize the research on Level 3 and Hybrid Level 3;map how the research focus on ERTMS Level 3 has developed over time;summarize key assumptions in research on Level 3 and Hybrid Level 3.This study uses a scoping review approach.This review method provides a comprehensive overview of the literature in a selected field.The literature searches in this study were primarily conducted in Scopus and Web of Science and were complemented with a follow-up search in Google Scholar.The topics are divided into two thematic areas:Effects on the Railway System and Technical Requirements.The thematic area Technical Requirements is further divided into the following subcategories:train,trackside,and communication.The effects on the railway system are measured using performance indicators:capacity,stability/robustness,and safety.ERTMS Level 3 has developed from a pure Level 3 to Hybrid Level 3.Hybrid Level 3 represents a pragmatic solution,but it may emerge as a threat to the long-term objective of the Level 3 moving block.Studies of Level 3 are based on a moving block solution,while studies of Hybrid Level 3 are mainly based on virtual sub-sections.Both Level 3 and Hybrid Level 3 studies tend to make assumptions that risk missing wider aspects of the railway system.There is also a need to correctly represent different ERTMS Level 3 configurations to ensure expected capacity gains.For a better understanding of the development and future path of ERTMS Level 3,it is interesting to study the following aspects:the historical development of ERTMS Level 3 research,the assumptions made about ERTMS Level 3,and the conditions and restrictions under which ERTMS Level 3 will be implemented.Assumptions and simplifications are necessary for modeling work,but there is also a need to highlight underlying assumptions in analyses of different ERTMS Level 3 configurations.展开更多
文摘The purpose of this paper is to categorize the research on Level 3 and Hybrid Level 3;map how the research focus on ERTMS Level 3 has developed over time;summarize key assumptions in research on Level 3 and Hybrid Level 3.This study uses a scoping review approach.This review method provides a comprehensive overview of the literature in a selected field.The literature searches in this study were primarily conducted in Scopus and Web of Science and were complemented with a follow-up search in Google Scholar.The topics are divided into two thematic areas:Effects on the Railway System and Technical Requirements.The thematic area Technical Requirements is further divided into the following subcategories:train,trackside,and communication.The effects on the railway system are measured using performance indicators:capacity,stability/robustness,and safety.ERTMS Level 3 has developed from a pure Level 3 to Hybrid Level 3.Hybrid Level 3 represents a pragmatic solution,but it may emerge as a threat to the long-term objective of the Level 3 moving block.Studies of Level 3 are based on a moving block solution,while studies of Hybrid Level 3 are mainly based on virtual sub-sections.Both Level 3 and Hybrid Level 3 studies tend to make assumptions that risk missing wider aspects of the railway system.There is also a need to correctly represent different ERTMS Level 3 configurations to ensure expected capacity gains.For a better understanding of the development and future path of ERTMS Level 3,it is interesting to study the following aspects:the historical development of ERTMS Level 3 research,the assumptions made about ERTMS Level 3,and the conditions and restrictions under which ERTMS Level 3 will be implemented.Assumptions and simplifications are necessary for modeling work,but there is also a need to highlight underlying assumptions in analyses of different ERTMS Level 3 configurations.
