The railway environment is characterized by various electromagnetic interferences (EMI) due to the large number of EMIs sources. In parallel, due to the variety of vulnerable systems (location, signalization, communication…) embedded or in the train vicinity, different techniques are required to study EMC issues. This work is focused on time-frequency tool adapted to the analysis of different EMI, whereas their significant differences in terms of frequency, power and time characteristics. Such tools could be integrated in real time spectrum analyzers in order to optimize measurements for railway EMC issues.