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  High-Speed Rail-Tunnel Aerodynamics - Advances and Issues

  The very rapid worldwide development of high-speed rail transportation focused attention on an entirely new set of aerodynamic issues, which were not relevant for conventional rail transportation. The most prominent are: Passenger health and comfort issues result from large pressure fluctuations generated in particular while entering tunnels and in case of trains crossing. Comfort issues arise in underground stations, because of pressure fluctuations and high air velocities. The aerodynamic load on rolling stock and the requirements on aerodynamic sealing increase. The growing aerodynamic drag increases the requirements on train traction power.

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