Abstract: The current development of digital technology is entering a new era of ubiquitous computing that integrates humans, machines, and objects (human society, information space, and physical world), and there is an urgent need to accelerate the construction of intelligent and comprehensive digital information infrastructure. In addition, digital railways vertically connect business scenarios at all levels and horizontally connect various professional systems, with increasingly high requirements for resources and service capabilities such as data, models, and computing power. This paper analyzed the current trend of digital platform applications in the industry, combined with the current status of railway infrastructure platforms, and analyzed the improvement needs of these basic platforms at the levels of effective resource integration, integrated service models, and business support. Based on this, the paper proposed the positioning, architecture, functional composition of the railway digital service platform, as well as the interactive and collaborative relationships between the basic platforms, studied key technologies to ensure the secure transmission of platform information, and provided reference for exploring and practicing the construction of intelligent comprehensive digital information infrastructure.