Creation of interlocking charts, which are related to the safety of train operation, requires a complicated logic and a large amount of manpower. This necessitates a computerized support system. A track diagram network is established with two types of networks, one representing switches and signal devices at specific points on the track and the other representing track circuits and signal devices in specific domains of the track, each expressing the routes of actual train operation and those in the position detection units of interlocking devices. The charts drawing function and automatic connection between signal devices through system control are realized by using a commercialized CAD interlocking charts has been developed by applying these techniques.

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