Abstract
Research on the underground logistics system (ULS) has been carried out for nearly 30 years, but the description of the global research network, research trends, and the discussion of advanced theories and practices have not been systematically reviewed so far. The concept of public freight has expanded a new development direction: metro-based underground logistics system (M-ULS). The purpose of this paper is to analyze this new model by taking underground logistics and public freight as the research object. We performed statistical analyses of 222 references and constructed three kinds of visualized bibliographic information experiments for regional collaboration, authorship collaboration, and keywords co-occurrence. Based on the scientometrics results, the evolution path of the literature evolution was drawn. We used cluster-analysis-based taxonomy to structure the recent relevant literature. According to the comprehensive review, the research stays in the theoretical research stage, mainly focusing on system concept and planning, traffic organization, and network operation. There is still a lack of discussion on engineering quantification and application implementation. Finally, this study highlights some brief ideas, discussions, and potential suggestions for future research. This bibliometric research is expected to provide researchers and practitioners with a panoramic description and in-depth understanding of ULS and M-ULS research.
Highlights
Urban freight accounts for an increasing proportion of urban transport tasks, and is very important to the operation of the city [1]
Can we find out the current international research status, hot spots, and research trends of underground logistics system (ULS), public transport, and metro-based underground logistics system (M-ULS)?
This study systematically investigated the academic development of global ULS, public transport, and M-ULS research by using the methods of scientific econometric analysis and scientific map
Summary
Urban freight accounts for an increasing proportion of urban transport tasks, and is very important to the operation of the city [1]. Traditional logistics cannot meet the increasing urban freight demand, and bring a huge burden to urban development. Scholars put forward the concept of “underground logistic system” (ULS) in the 1990s [2]. As an advanced intelligent transport system, a ULS can effectively ensure the efficiency, reliability, and sustainability of urban logistics distribution [3]. A ULS is a complex system involving many disciplines, such as above-ground and underground connection, logistics and engineering, construction, and management. Research progress is slow due to the huge investment, vague income, and lack of forward-looking theory. STU Last Mile Freight Type Analysis Content Service Range [70] Case Study Simulation Metro Track
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