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鉄道
なぜ単線の路線で電車はぶつからないの？ いちばん分かりやすい「単線」と「閉そくの仕組み」のお話 (1/3) - ねとらぼ
鉄道
September 20, 2020 at 16:24:34 GMT+9 * ·
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https://nlab.itmedia.co.jp/nl/articles/2009/19/news010.html
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