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In this paper the features of Qinghai-Tibet Railway and its requirement for a signaling system are introduced. To meet system requirements, a train control system which is based on satellite location and intelligent autonomous decentralized systems (IADS) technologies is discussed and planned to apply to low-density lines such as the Qinghai-Tibet line. The configuration of the system and some key technologies adopted in the system are also presented. Based on IADS, the system not only has autonomous controllability, flexibility of construction and on-line expandability. but also some intelligence.