The high-speed railways require more viaducts than conventional railways. The dynamic interaction effect between train and viaduct are important issue due to the risk of derailment, structural safety and deterioration of the passenger comfort. In this study, viaduct is modelled as a multi-bay frame. The multi-bay frame is modelled by finite element method. The train is idealized as a two-axle system with 4 degrees of freedom. The equations of motions of the coupled vehicle-structure system are determined via generalized Lagrange's equation. The Wilson-theta time integration method is employed to determine the dynamic response of the system. The effective mode shapes are investigated using 3D frequency-velocity-amplitude graphs. The resonant response has been determined at first and second modes of 1 and 2-bay frames.