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With the increasing of the speed of Ordinary Fast Train and EMU on the existing railway, the pneumatic pressure will be significantly increased when they passed each other. Therefore, the influence to the comfort and safety of ordinary fast train and EMU caused by passing pressure wave will clearly exacerbated. When ordinary fast train with the speed of 140 km/h and EMU with the speed of 200 km/h passed each other, the pressure during the process of rendezvous on open tracks and intersection in the tunnel was simulated and calculated by Reynolds averaged Navier - Stokes equations and RNG k-e equations. Meanwhile, the calculated results was used to analyze the safety of windows from three aspects respectively are the static strength, dynamic impact strength of window glass and window installation strength. Calculation results show that the side windows was effected by the positive and negative pressure when Ordinary Fast Train and EMU intersected on open tracks, it was mainly effected by the negative pressure during the process of rendezvous in the tunnel. By the superposition of the compressed wave and the expansion wave, the trough of the head wave and the peak of the coda wave fluctuate less, while the head wave troughs and tail wave crest of larger fluctuations, the maximal value of negative pressure at the window’s center of the EMU is about 3.87 times that of the open line, and the maximum value of the amplitude of the pressure wave close to the average change rate of the maximum pressure. The maximal value of negative pressure at the center of the window of the Ordinary Fast Train is about 4.25 times that of the intersection on open tracks. There is a larger difference between the maximum value of pressure wave amplitude and the average change rate of maximum pressure. The greater the aspect ratio of the window, the greater the strength of the installation structure, the wider the installation structure, the greater the installation strength.