In general, propagation properties and models play an important role in wireless coverage prediction and communication link budget. From the well-researched classical HATA and WINNER II channel models in [2] and [3], it can be concluded that the propagation characteristics are sensitive to the environments. In engineering implementations, trains usually travel in the standard suburban or rural areas. But this is not strictly accurate since the HSR environments also consist of viaducts, tunnels and cuttings [4] which are distinct from the fully-researched standard scenarios. For viaduct scenarios, viaduct bridges raise the antennas, and create a relatively clear
line-of-sight (LOS) channel, which make it largely differ from other LOS channels. Meanwhile, properties under plain and hilly terrains are also special in HSR environments. Hence, in-depth investigations on the fading behaviors of these new scenarios are urgently required, but are not present in most of the existing literature.