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Abstract—The publication describes the use of fiber-optic sensors in the rail applications. We created a measuring system and sensor based on the fiber Bragg gratings (FBG). The basic tracked parameters of vehicles are detection and speed. The proposed system was tested in the real tram traffic. The system is characterized by a detection capability of 100 %, speed measurement is characterized by an absolute error of + - 3 kph. Sensors can be connected to existing city fiber networks. Information could be remotely processing because the spectral evaluation of sensors is not limited by the output power of the radiation source.