1 BBAA VI International Colloquium on: Bluff Bodies Aerodynamics & Applications Milano, Italy, July, 20-24 2008 WIND TUNNEL TESTS ON TRAIN SCALED MODELS TO INVESTIGATE THE EFFECT OF INFRASTRUCTURE SCENARIO Federico Cheli ∗ , Roberto Corradi ∗ , Daniele Rocchi ∗ , Gisella Tomasini ∗ and Emilio Maestrini † ∗ Dipartimento di Ingegneria Meccanica Politecnico di Milano, Campus Bovisa, Via La Masa 1, 20156 Milano, Italy † Trenitalia, viale S. Lavagnini, Firenze e-mail: federico.cheli@polimi.it , roberto.corradi@polimi.it , Daniele.rocchi@polimi.it , gisella.tomasini@polimi.it Keywords: wind tunnel tests, cross wind, aerodynamic coefficients, infrastructure scenario, risk analysis Abstract. The cross wind risk analysis is today, within the European railway operators, one of the most important items related to the safety problem. In order to define the risk associ- ated to the cross wind along a railway line, the effects of the infrastructure scenarios on the aerodynamic loads acting on a vehicle have to be investigated. A typical railway line is mainly characterized by two types of scenario: viaduct and embankment. In this work, the aerodynamic coefficients of the ETR500 train measured, through wind tunnel tests, for the standard TSI infrastructure scenarios (flat ground with and without ballast and rail and 6m- high embankment) and for a typical Italian viaduct are presented. Moreover, each infrastruc- ture is characterized in terms of flow modification with and without the train model.