Abstract: To support the digital transformation of railway system model construction, this paper integrated Model-Based Systems Engineering (MBSE) into the field of railway system architecture design, elaborated the MBSE modeling methods and processes oriented to railway system design, constructed an MBSE model of railway architecture, and designed a corresponding railway system architecture modeling platform. Taking the railway passenger transport scenario as an example, the paper carried out platform application research, and adopted Systems Modeling Language (SysML) to complete the construction of requirement models, function models and architecture models, as well as the parameter design and verification of these models. Practice verification results show that the platform can effectively improve the efficiency and quality of railway system modeling, and provide theoretical and technical support for the promotion and application of MBSE in the field of railway modeling.