phase () train is detected by the ground position on the transmission of election administration by train for performing wireless the train control system, and to solve the problem of re detection that may occur when performing the position correction according to the correction character. On-board device 20 in, for example, measuring the train location by counting the number of revolutions of the speed generator 12, on the basis of the train position, and confirming the train occupancy guess range which may itself be ground train device The transmission (30). At the time of passing through the installation point of the corrected character 50, and corrects the relevant correction character 50 based on the communication result with the train position. And, in the case where the correction of the character is corrected by the train location (50) in the retraction direction correction, and the latest position of the train until the train reaches a position immediately before the correction, the location of the train on the basis of the train occupancy last calibration transmission, confirming the guessed range, and if the latest location of the train has reached the position of the train immediately before calibration, and after the transmission, confirming the train occupancy guess the range of the train on the basis of the latest position,. ;
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