Warning system for actuation by a passenger of a railway vehicle, comprising: - at least one mobile terminal comprising a user interface and a memory storing at least one software application suitable for generating an warning signal; - a warning processing module, located in a coach of the rail vehicle, configured to signal the receipt of the warning signal to at least one agent of the rail vehicle; and - a data transmission link between the mobile terminal and the warning processing module, configured to transmit the warning signal generated by the software application to the warning processing module, the data transmission link comprising a central communication network and a wireless connection between the mobile terminal and the central communication network, the central communication network being a local wire network comprising at least one wireless connection terminal, characterised in that: - the warning system comprises at least one mobile electronic device, for example associated with an agent, the warning processing module being configured to redirect the warning signal to the mobile electronic device F, and, in order to identify, from the warning signal, location information of the mobile terminal, the warning system comprises the following features: - the mobile terminal is configured so that the warning signal incorporates location identification data associated with the wireless connection terminal, the identification data being transmitted to the mobile terminal when the wireless connection is established, the location identification data being stored in the memory and incorporated by the software application in the warning signal, - the mobile terminal is configured so that activation of the software application brings up an acquisition window, allowing the passenger to indicate location information, - the warning processing module is configured to identify location information of the mobile terminal from the warning signal, and - the warning processing module is configured to trace the path of the warning signal through the central communications network. - at least one mobile terminal comprising a user interface and a memory storing at least one software application suitable for generating an warning signal; - a warning processing module, located in a coach of the rail vehicle, configured to signal the receipt of the warning signal to at least one agent of the rail vehicle; and - a data transmission link between the mobile terminal and the warning processing module, configured to transmit the warning signal generated by the software application to the warning processing module, the data transmission link comprising a central communication network and a wireless connection between the mobile terminal and the central communication network, the central communication network being a local wire network comprising at least one wireless connection terminal, - the warning system comprises at least one mobile electronic device, for example associated with an agent, the warning processing module being configured to redirect the warning signal to the mobile electronic device F, and, in order to identify, from the warning signal, location information of the mobile terminal, the warning system comprises the following features: - the mobile terminal is configured so that the warning signal incorporates location identification data associated with the wireless connection terminal, the identification data being transmitted to the mobile terminal when the wireless connection is established, the location identification data being stored in the memory and incorporated by the software application in the warning signal, - the mobile terminal is configured so that activation of the software application brings up an acquisition window, allowing the passenger to indicate location information, - the warning processing module is configured to identify location information of the mobile terminal from the warning signal, and - the warning processing module is configured to trace the path of the warning signal through the central communications network.