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The High Speed/High Capacity railway lines uses the 2×25kV-50Hz power supply system that is supplied at high-voltage by dedicated lines that can be placed in close proximity to the railway line. The power system adopted for HS railway lines includes a lot of harmonic sources. Resonance phenomena can cause harmonics amplification with consequent problems as voltages distortion, interference problems and electromagnetic interference with communication lines. This paper presents a detailed model for the railway system (including the primary line) with the aim to evaluate the resonance frequency of the impedance seen by the pantograph.