Abstract: The bogie section is a dominant aerodynamic noise source of high-speed trains. Using wind tunnel experiments, the aerodynamic noise and pressure inside the cavity of a 1∶20 bogie section are measured. The scaling law of aerodynamic noise and pressure fluctuation in the motor bogie (MB) and trailer bogie (TB) cavities and their dependence on the Reynolds number are analyzed. The results show that turbulent pressure fluctuation and sound pressure can be distinguished by the scaling law analysis of the near-field aerodynamic noise in the bogie sections, i.e., the turbulent pressure fluctuation power in the cabin increases with the 3.2-3.9 power of the velocity, while the sound pressure level increases with the 6-8 power of the velocity. The cutoff frequency on the back wall of the bogie section is higher than that on the top wall. The aerodynamic noise has a broadband frequency spectrum with multiple peaks, which are generated by the acoustic resonance and do not vary with the Reynolds number. The tonal noise whose frequency increases with the increase of the Reynolds number, is generated by the airflow impinging on the lower part of the wheelset. The peak frequencies of aerodynamic tonal noise in the bogie area are related to the dimension of the bogie cavity and the wheelset, while the broadband noise level can be affected by the form of the bogie. The results provide theory and data support for a deep understanding of the aerodynamic noise sources and the noise reduction control inside the bogie section.