Contents I. Introduction
With the acceleration of urbanization and the increase in traffic demand, traffic congestion has become a bottleneck in urban development. Due to the limitations of urban ground, it is difficult to meet the increasing traffic demand only by improving and increasing ground transportation facilities. More and more experts are focusing on the development and utilization of underground space [1]–[3]. Underground Logistics System (ULS) refers to a transportation and supply system within and between cities that realizes the delivery of goods through underground pipelines or tunnels similar to subway[4], [5]. There are mainly three implementation modes [6]–[8]. Firstly, it is based on urban subway by adding logistics transportation into existing urban subway system, so as to maximize the utilization of urban subway resources and reduce the cost of ULS. The second is based on pipeline cabin, that is, circular or square capsule structure is used as transport carrier, and track or pipeline is similar to the carrier contour. The third is the vehicle-based ULS, which builds underground network and use special vehicles to deliver freight, such as AGV of the Netherlands, DM of dual-use truck of Japan and Cargo Cap of Germany. This paper is based on the third mode.
