 This research examined the impact of interconnected transportation systems on the resilience of public transit in Hong Kong. It found that interconnected systems can reduce topological vulnerabilities, increase attack tolerance, and enhance post-disruption interoperability. Additionally, it showed how integrating vulnerable systems can further strengthen resilience. Finally, this paper demonstrated the potential to integrate different modes of transportation for greater robustness. Overall, this research suggests that interconnected transportation systems are a viable option for enhancing resilience in cities. This article was authored by Zixian Xu and Shorat S Chopra.