This article analyzes pedestrian accessibility to Points of Interest (POI) around railway stations in Katowice within the 15-min city framework. The study employs an isochrone-based approach (5, 10, and 15 min) using street network and OpenStreetMap data. POI categories and population data were examined using statistical measures, the Herfindahl-Hirschman Index (HHI), and taxonomic analysis. Results indicate strong concentration of urban functions within central stations, while peripheral stations exhibit limited service accessibility within a 15-min radius, reflecting spatial imbalance. Extending isochrone range increases service variety but does not resolve central dominance. Findings demonstrate pronounced functional concentration around central railway stations, with peripheral stations remaining marginal. The identified imbalance highlights the need for diversified urban planning. Strengthening railway stations as activity hubs and developing surroundings according to transit-oriented development (TOD) principles is crucial. Integrating these areas with the 15-min city concept may reduce car dependency and enhance quality of life for residents.