Abstract: The study concerns the application of Building Information Modelling (BIM) in the process of railway infrastructure upgrading. The research site was railway line no. 218 Prabuty-Kwidzyn (Poland). The main aim was to verify integration of BIM tools, particularly OpenRail Designer, to enhance the geometric complexity and operational efficiency of railway projects. The methodology included: terrain data acquisition, reconstruction of the existing state, preparation of new project documentation. Upgrading was based on redesigning track alignments, introducing dual tracks, and achieving a target maximum speed of 120 kph, thereby improving both technical and operational parameters. The findings show BIM's potential for interdisciplinary collaboration. Future work suggests integrating train movement simulations to improve the evaluation of modernization benefits. Keywords: BIM, upgrading, railway line, OpenRail Designer, designing 3D
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