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A computational model to solve for the dynamic interaction of a high-speed train and railway structure including derailment during an earthquake is given. An efficient mechanical model to express contactimpact behaviours between wheel and rail before derailment, between wheel and the track structure after derailment, and between the car body and railway structure during and after derailment is presented. The motion of the train with nonlinear springs and dampers is modelled in multibody dynamics. The railway structure is modelled with various finite elements. The combined dynamic response of the train and railway structure during an earthquake is obtained by solving the nonlinear equations of motions of the train and railway structure in the modal coordinates subjected to the interaction between the train and railway structure. Numerical examples of a high-speed train running on the railway structure after derailment during an earthquake are demonstrated.

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