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It is foreseen that the next generation of wireless cellular network would integrate the relaying scheme. In the relaying scheme, user equipments (UEs) are not only able to communicate directly to the base station (BS) but can also use some relay stations (RSs) to relay their data to the BS. In this paper, we analyze the Call Dropping Probability performance based on the variation in received signal power over distance due to path loss and shadowing. We mainly focus on the scenario in which RSs are fitted on a fast-moving train to cover UEs on the train and improve the communication quality of conventional wireless cellular networks along the railway. By comparing with conventional wireless cellular network without relaying, the results show that under certain conditions mobile relays offer tangible Call Dropping Probability performance improvement benefits.