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The Jōban Line connects Tokyo and the Tōhoku region. After the opening of the Tōhoku Shinkansen in 1982, the Jōban Line was split into two parts at Iwaki. South of Iwaki is mainly double track (Ayase - Toride is quad track), and north of Iwaki is predominantly single track. After the Fukushima disaster in 2011, the Jōban Line is further segmented in the Iwaki – Sendai section.