An assembly of a railway vehicle comprising a plurality of cars, and a device for managing travelers and baggage, the management device comprising: - for each traveler and for each piece of baggage, an electronic tag specific to this traveler or this piece of baggage, each electronic tag having a respective identifier and being associated with information, and each electronic tag in particular being associated with at least one traveler, - for each traveler, a portable terminal carried by this traveler; - a plurality of electronic gantries (24, 26, 28), each gantry (24, 26, 28) being configured to detect the identifiers of the electronic tags crossing it, - a central management system comprising means for analyzing information relating to each electronic tag, - means for transmitting, from each electronic gantry (24, 26, 28) to the central management system, identifiers of the electronic tags crossing this electronic gantry (24, 26, 28), - means for transmitting, from the central management system, alerts addressed to the portable terminal of each traveler whose electronic tag associated with this traveler crosses an electronic gantry (24, 26, 28), characterized in that each access door of each car of the railway vehicle comprises one of the electronic gantries (24, 26, 28), and in that the central management system is configured so that the alert issuing means issue an alert in each of the following cases: - an electronic tag enters the railway vehicle while it is not registered for this railway vehicle, - an electronic tag leaves the railway vehicle at a station that does not correspond to an arrival station provided for this electronic tag, - an electronic tag associated with a traveler crosses an electronic gantry (24, 26, 28) separately from the electronic tag specific to this traveler, - the electronic tag specific to a traveler leaves a car or the railway vehicle separately from at least one other electronic tag associated with this traveler, the electronic tag specific to a traveler enters a car of the railway vehicle, in which case the alert indicates a number of the corresponding car. - for each traveler and for each piece of baggage, an electronic tag specific to this traveler or this piece of baggage, each electronic tag having a respective identifier and being associated with information, and each electronic tag in particular being associated with at least one traveler, - for each traveler, a portable terminal carried by this traveler; - a plurality of electronic gantries (24, 26, 28), each gantry (24, 26, 28) being configured to detect the identifiers of the electronic tags crossing it, - a central management system comprising means for analyzing information relating to each electronic tag, - means for transmitting, from each electronic gantry (24, 26, 28) to the central management system, identifiers of the electronic tags crossing this electronic gantry (24, 26, 28), - means for transmitting, from the central management system, alerts addressed to the portable terminal of each traveler whose electronic tag associated with this traveler crosses an electronic gantry (24, 26, 28), characterized in that each access door of each car of the railway vehicle comprises one of the electronic gantries (24, 26, 28), and in that the central management system is configured so that the alert issuing means issue an alert in each of the following cases: - an electronic tag enters the railway vehicle while it is not registered for this railway vehicle, - an electronic tag leaves the railway vehicle at a station that does not correspond to an arrival station provided for this electronic tag, - an electronic tag associated with a traveler crosses an electronic gantry (24, 26, 28) separately from the electronic tag specific to this traveler, - the electronic tag specific to a traveler leaves a car or the railway vehicle separately from at least one other electronic tag associated with this traveler, - an electronic tag enters the railway vehicle while it is not registered for this railway vehicle, - an electronic tag leaves the railway vehicle at a station that does not correspond to an arrival station provided for this electronic tag, - an electronic tag associated with a traveler crosses an electronic gantry (24, 26, 28) separately from the electronic tag specific to this traveler, - the electronic tag specific to a traveler leaves a car or the railway vehicle separately from at least one other electronic tag associated with this traveler, the electronic tag specific to a traveler enters a car of the railway vehicle, in which case the alert indicates a number of the corresponding car.