To realize a train radio system capable of calling a train from a central control station and calling another train from the train by a one-touch operation.

The central control station periodically inquires base stations to acquire a train presence information in each zone, and displays the train number and zone number of it on a display unit 14 of a command control board. When one of selector switches 13 corresponding to the train numbers on the display is pressed, the control station transmits the train number to the corresponding base station based on the train number and the corresponding zone number, to call the train mobile station of the train number. Moximity train calling button I provided in the mobile station. When the button is pressed, the mobile station transmits the information to the control station via the base station. The control station receiving this examines the Moximity zone based on the number of the base station, which is a transmitter, and calls the train present in the zone.