In the scope of the InBridge4EU project https://inbridge4eu.eu/ a database has been developed containing information on more than 500 bridges, including the experimental response to approximately 2000 train passages. The database is accessible from Python and Matlab using API Token Authentication which allows the analysis of the structural behaviour of the bridges in a user-friendly way. In this work, the time-frequency analysis carried out on some of the bridges included in the database is presented. Bridges of different typologies have been analysed. The analysis has been carried out using the continuous wavelet transform with the mother wavelet Morse considering that this function presents a better correlation with the original signals. The results obtained have allowed to detect the response of the bridge in free vibration, after different train passages, and forced vibration. This aspect is relevant in the identification of the modal parameters of the structure, and in particular in that of structural damping, which is estimated from the free vibration data. Also, the analysis provides the predominant frequencies in the structural response before, during and after the passage of the train over the bridge. These frequencies are compared with the natural frequencies of the structure obtained from the response to ambient vibration and with the excitation frequencies depending on train characteristics and speed (bogie passing frequency, axle passing frequency and their harmonics). Conclusions about the influence of the passing vehicle on the bridges modal parameters are finally extracted.