通勤五方面作戦 - Wikipedia
https://ja.wikipedia.org/wiki/%E9%80%9A%E5%8B%A4%E4%BA%94%E6%96%B9%E9%9D%A2%E4%BD%9C%E6%88%A6
中央快速線とか常磐快速線とかが複々線になってるのはこの作戦のせい
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