Abstract
This paper presents an analysis of information system and data structures used by the railway infrastructure manager in the Slovak Republic, focusing on system architecture, functional integration and data flows. The study examines the transformation of the national information environment from a fragmented system landscape into an integrated platform built around the Complex Interoperable System (KIS), which integrates timetable construction through the MK module, real-time traffic management and interoperability interfaces. The research is based on qualitative analysis of technical documentation, professional literature and regulatory frameworks, including Technical Specifications for Interoperability (TSI). The results indicate that although functional consolidation has significantly improved system consistency and operational transparency, partial fragmentation of data structures and incomplete integration of legacy applications remain major limitations. The study highlights the importance of unified data models, systematic data governance and deeper system integration as necessary conditions for further modernisation. Emphasis is placed on the alignment of national information systems with European interoperability requirements, particularly TSI TAF and TSI TAP. The findings contribute to a better understanding of the role of digital platforms in infrastructure management and provide recommendations for improving reliability, efficiency and data consistency in railway information systems.