As an object travels through open or confined space, the characteristics of the pressure waves differ. Specifically, a compression wave generated because of the movement of an object in a confined space develops into a normal shock wave, even when the object moves at subsonic or transonic speeds. This study analyzed compressible flow and wave phenomena in the Hyperloop system, which represents the application of a high-speed tube-train system in confined space. Two-dimensional simulations for Reynolds-Averaged Navier-Stokes Equations (RANS) were performed to investigate the flow field near the pod and the propagation of pressure waves such as leading shock wave (LSW), trailing shock wave (TSW), oblique shock wave (OSW), backward expansion wave (BEW). When the pod moves at a low Mach number, the LSW and BEW propagates in opposite directions with high- and low-pressure magnitudes, respectively. In this regime, choked flow does not occur between the tube and pod at the minimum cross-sectional area. However, as the Mach number of the pod increases, choked flow occurs, resulting in the generation of LSW, OSW, and BEW with different pressure magnitudes. In particular, the pressure magnitude of the OSW is significantly lower. As the Mach number of the pod increases further, the TSW behind the pod is generated and propagates. This study provides insights into the wave behaviors in different Mach numbers of the pod, which can inform the design of the Hyperloop system.