Urban transit systems (UTS) have become increasingly critical components of urban infrastructure due to their high convenience and efficiency in public transportation. Mature transit networks feature extensive service coverage and complex interdependencies to meet growing demands for efficient mobility [1]. However, such complexity also poses significant challenges for operational management. Hence, vulnerability assessment is essential for ensuring the safety and security of urban transit operations. In highly interdependent systems, the failure of a single component can have far-reaching effects on other system elements, emphasizing the need for comprehensive vulnerability evaluation [2]. For instance, the disruption of one station can redistribute service loads and trigger cascading failures across the network [3]. Therefore, effective methods are required to assess system vulnerability, particularly under scenarios involving cascade failures.