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The use of global navigation satellite systems (GNSS) will provide significant advantages for ensuring the control of train movements on railway networks equipped with European Rail Traffic Management System/European Train Control System (ERTMS/ETCS). Indeed, this disruptive technology can play an important role for reducing the rail infrastructure's equipment by enabling trains to determine their position in an autonomous way. Specific associated hazards have to be considered in the European signaling system. From this perspective, performances of GNSS-based localization systems were analyzed in different past studies. They highlighted what they can bring to the railway domain. For going further than performance-centric analyses to help inserting these systems safely in rail applications, this paper want also to focus on their operating uses. For that, the safety evaluation proposed in this paper is able …