## 1 Introduction  
The meaning of cross-border is between different countries, or involving living beings of different countries [1]. Cross-border can be derived from cross-border E-Commerce, cross-border cooperation, cross-border transportation, cross-border logistics, and so on [2; 3; 4]. These concepts have very important strategic significance for promoting economic integration and trade globalization [5; 6]. Cross-border logistics is the basis of cross-border trade and the flow of goods, and which not only links nations through foreign trade but is also a pillar of national economic development [7]. Cross-border logistics platforms can support the comprehensive requirements of the development of modern logistics enterprises, strengthen the role of information technology, and electronic commerce in logistics enterprises [8]. The platform also plays an important role in promoting the integration of information flow logistics resources [9]. Through cross-border logistics platforms, government departments have also strengthened the macro and standardized management of the market and provided diversified logistics information services [10]. In September 2013, President [PERSON] of China proposed building the Silk Road Economic Belt to boost regional cooperation and called for the establishment of a new regional cooperation model. These proposals are collectively called the One Belt and One Road (OBOR) initiative or the Belt and Road initiative (BRI) [11], the geographical coverage of which is illustrated in Figure 1. There are more than 60 countries along the Silk Road Economic Belt and the 21 st Century Maritime Silk Road, covering a population of 3.2 billion, which accounts for 43.4% of the global population; the total economic aggregate is $12 trillion (a global share of 16%) and the total trade amount is $7,185,550 million, which accounts for 21.7% of total world trade [12]. OBOR is an unprecedented market construction project. In accordance with the goals of the OBOR strategy, cross-border e-commerce is growing rapidly. According to reports from Alibaba [13], half of the customers--more than 100 million--on its Business-to-Customer (B2C) platform are located within the OBOR region. International logistics cooperation is therefore essential to meeting growing regional demand. The implementation of OBOR accelerates the logistics infrastructure interconnecting Asia, Europe, and Africa, which also strengthens the construction of infrastructure such as hub ports, airports, railways, and other ports. The logistics tunnels between China and Europe include ocean shipping transport tunnels, air transport tunnels, and land transport tunnels [12]. The CR Express is the international railway intermodal container train between China and Europe, traveling through countries along the Silk Road Economic Belt, having a fixed train number, route and other conditions [14]. As an important part of the OBOR, the CR Express has become the backbone land transport tunnel in OBOR logistics because of its short distance, fast speed, safety record, and minimal impact to the natural environment [12]. The opening of the China Railway Express (CR Express) is the key element in realizing the facility connectivity and unimpeded trade principles set forth in the OBOR initiative. The first CR Express (Chongqing-Duisburg) successfully opened on 19 March 2011. The CR Express had opened more than 16,000 trains by the end of June 2019, and reaches 53 cities in 16 European countries [14]. The increase in the number of CR Express trains between 2011 and 2019 is shown in Figure 2. In recent years, the service and operation quality of CR Express have been continuously improved, and it has good international brand effect and development prospects. It has effectively pushed China to the world  
Figure 1: Map of the One Belt and One Road (OBOR) initiative. and opened up economic and trade exchanges between countries along the Silk Road Economic Belt. The CR Express has become the iconic achievement of OBOR construction [15].