The maintain railway signaling equipment, and to analyze its trouble, precise measurement of local equipment on the rail track for a long time is demanded. Nevertheless on the rail track, it is difficult. In this situation, effective measurement should be realized, when remote measurement method is developed. We had developed remote measurement equipment, which is NOT portable and sampling speed is 10kHz. In this system, transient phenomena are not analyzed perfectly Therefore portable system with high speed sampling was developed. The development was divided into two. One is measurement system on the rail track, and the other one is data transmission. The interface between these systems is decided as general interface RS-232C, as the result of it, this system is able to be extended easily for the future. There are two big characteristics in this system. First, portable monitoring system is the first trial. Second, signaling cable is applied to digital data transmission for the first time.
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