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.   ATC (Automatic Train Control), ATP (Automatic Train Protection)  ATS (Automatic Train Stop)         [1].    ATC  ATP        ATS    [2].    ATS  ATO   .            .   ATP     ATC  ATS      .           .  ATC, ATP, ATS           .     ,  PES (Programmable Electronic System)        [3].   PES     [4].  PES       k out of n  [5].     RAMS (Reliability, Availability, Maintenance, Safety)          . k out of n              .     Abstract There are ATC (Automatic Train Control), ATP (Automatic Train Protection), ATS (Automatic Train Stop) and ATO (Automatic Train Operation) etc. in train control systems. As various train control systems are installed according to sections, on-board signaling systems are installed to apply to the section. Hence, operation flexibility of trains is decreased. In other words, when trains are operated in the section where other train control systems are used, the on-board signaling systems are changed. Recently, a study on the combined on-board signaling system has been researched to solve this problem. The combined on-board signaling system consists of ATC, ATP and ATS device. Because the train control systems are vital, it needs to design the combined on-board signaling system by using k out of n system. In this paper, when k out of n system is applied in the combined on-board signaling system, the reliability and loss cost are analyzed by using failure rate in each device. Hence, the ideal number of systems is presented according to the number of outputs.

A Study on the Analysis of Reliability and Loss Cost by Appling k out of n System in Combined On-board Signaling System