Jisho

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Noun
1. interlock; interlocking device
Wikipedia definition
2. InterlockingIn railway signalling, an interlocking is an arrangement of signal apparatus that prevents conflicting movements through an arrangement of tracks such as junctions or crossings. The signalling appliances and tracks are sometimes collectively referred to as an interlocking plant. An interlocking is designed so that it is impossible to give clear signals to trains unless the route to be used is proved to be safe.
Read “Interlocking” on English Wikipedia
Read “連動装置” on Japanese Wikipedia
Read “Interlocking” on DBpedia

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