Jisho

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閉塞 (鉄道)
Wikipedia definition
1. Signalling block systemSignalling block systems enable the safe and efficient operation of railways, so as to avoid collisions between trains. Block systems are used to control trains between stations and yards, and not normally within them. Any block system is defined by its associated physical equipment and by the application of a relevant set of rules. Some systems involve the use of signals, while others do not.
Read “Signalling block system” on English Wikipedia
Read “閉塞 (鉄道)” on Japanese Wikipedia
Read “Signalling block system” on DBpedia

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