The Estakáda Masaryk in the centre of Prague is part of the new railway connection between Prague’s main station and Prague Holešovice station. In the course of the prevailing investigation an extensive dynamic monitoring campaign was undertaken in order to examine the Estakáda Masaryk’s initial condition. The dynamic assessment with BRIMOS was widely performed according to the Czech code ČSN 736209 but in addition to that the measurement provided several supplementary information.