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Transport infrastructure is crucial for society, and deliberate actions to disrupt it can severely impact economic activities, lead to significant financial losses, erode user trust, and harm the economy. This text explores the concept of critical transport infrastructure and emphasizes the importance of network and information systems for effective management. Protecting these systems from unauthorized access is essential. Companies and organizations are motivated to secure their critical transport infrastructure due to a uniform legal framework established by the European Union, which mandates that EU legislation be transposed into national laws by member states. The overarching aim of this legislation is to ensure a consistent level of protection for consumers and businesses against cybersecurity threats. To achieve this, operators of critical transport infrastructure must first be identified, followed by the establishment of protection requirements proportional to the risks faced by their networks. These risks must align with the current state of cybersecurity technology. Adopting a defense-in-depth approach, effective protection of critical transport infrastructure necessitates a suitable combination of technical and organizational measures, along with adequate physical security for relevant assets.