A method for generating an electromagnetic noise scenario for the monitoring of the reliability of sensitive equipment, comprising the steps of: - defining environmental electromagnetic conditions relating to the environment of the sensitive equipment, and - generating, from said environmental electromagnetic conditions, an electromagnetic noise scenario comprising a set of transient noises, characterized in that said environment is a train and in that the method includes steps consisting of: - making preliminary measurements of electromagnetic noises in various environments and storing data relating to these measurements, - analyzing the durations, the rise times and the repetition rate of the data stored in the previous step to extract therefrom statistical laws of distribution of the parameters characteristic of the electromagnetic noises, based on the measurement conditions, and storing the statistical distribution laws in a database, - determining a positioning of the sensitive equipment in said environment, - setting at least one parameter among the maximum speed, the type of electrification of the line or the age of the catenary, - by using the database, generating said electromagnetic noise scenario also from said positioning of the sensitive equipment, to impact the parameters of the law that controls the amplitudes of the transient noises, and by taking into account said at least one parameter to impact the parameters of the statistical distribution law that controls the time intervals separating two transient events, said electromagnetic noise scenario also comprising a set of permanent noises, the method being further characterized in that it includes steps consisting of programming a signal generator with said electromagnetic noise scenario, and of emitting, using said signal generator, a signal corresponding to said electromagnetic noise scenario destined for said sensitive equipment. - defining environmental electromagnetic conditions relating to the environment of the sensitive equipment, and - generating, from said environmental electromagnetic conditions, an electromagnetic noise scenario comprising a set of transient noises, - making preliminary measurements of electromagnetic noises in various environments and storing data relating to these measurements, - analyzing the durations, the rise times and the repetition rate of the data stored in the previous step to extract therefrom statistical laws of distribution of the parameters characteristic of the electromagnetic noises, based on the measurement conditions, and storing the statistical distribution laws in a database, - determining a positioning of the sensitive equipment in said environment, - setting at least one parameter among the maximum speed, the type of electrification of the line or the age of the catenary, - by using the database, generating said electromagnetic noise scenario also from said positioning of the sensitive equipment, to impact the parameters of the law that controls the amplitudes of the transient noises, and by taking into account said at least one parameter to impact the parameters of the statistical distribution law that controls the time intervals separating two transient events, said electromagnetic noise scenario also comprising a set of permanent noises, the method being further characterized in that it includes steps consisting of programming a signal generator with said electromagnetic noise scenario, and of emitting, using said signal generator, a signal corresponding to said electromagnetic noise scenario destined for said sensitive equipment.