The one dimensional (1 D) unsteady flow induced by a high speed train entering a tunnel is numerically studied by the method of characteristics. The tube area is dependent on time and distance. The energy equation used by Kage et al. is corrected to avoid the conflict with the isentropic assumption. The effect of the tunnel hood on the pressure wave is studied near the tunnel exit. Results show that the tunnel hood is useful in reducing the peak value and the time derivative of the pressure wave.  The one dimensional (1 D) unsteady flow induced by a high speed train entering a tunnel is numerically studied by the method of characteristics. The tube area is dependent on time and distance. The energy equation used by Kage et al. Is corrected to avoid the conflict with the isentropic assumption. The effect of the tunnel hood on the pressure wave is studied near the tunnel exit.  show that the tunnel hood is useful in reducing the peak value and the time derivative of the pressure wave.