As train speed increases, aerodynamic problems become increasingly important for railways. In open sections, passing of a train nose, a train tail and pantograph shields generate pressure variations along the wayside to cause environmental problems, such as rattling of window frames and shutters of houses near the railway. These phenomena are classified as infra-sound. It is necessary to solve the problem to operate high-speed trains in the densely-populated residential areas along the railways. This paper describes the results of recent researches conducted to clarify the phenomenon of the near-field pressure variation caused by the moving pressure field around trains and develop effective countermeasures for reducing the pressure variation. We investigated the effect of the pressure barrier and train nose configuration as countermeasures.