As a high-speed train passes through a tunnel, the intense aerodynamic pressure wave
outside the train penetrates into the passenger compartments, changing the pressure
environment inside the train and causing discomfort to passengers. This phenomenon
varies enormously among tunnels of different lengths. To evaluate the real influence of
tunnel length on the interior pressure environment of the carriages and ensure passenger
comfort, field measurements were conducted on a CRH2A train operating on the Hefei …