「多客期は2号車と3号車の間に増2号車を増結した6両編成で運転されている」なるほど https://ja.m.wikipedia.org/wiki/%E3%82%B9%E3%83%BC%E3%83%91%E3%83%BC%E3%81%AF%E3%81%8F%E3%81%A8
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