In this master's thesis I present a possible upgrade plan of a railway line on the B side of the Postojna railway station. In this thesis I consider two possible scenarios. The first scenario foresees the demolition of track 5. The second scenario involves the construction of a new high-speed railway line and the demolition of tracks 5 and 8. In this thesis I paid special attention to the switches and the design of the geometric elements of the curved switches. Due to the improvement of the geometric elements of the tracks, the geometric elements of all the curved switches are also changed. I show the calculations of the geometric elements of the curved switches with sketches.
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