Tone River
In 1883, the first segment between Ueno and Kumagaya opened. In 1885, it was extended to Utsunomiya, but the Tone River had to be crossed by boat. Following construction of the Tone River Bridge in 1886, Utsunomiya and Ueno were directly connected. The line gradually extended further to the north; to Kōriyama, Sendai, Ichinoseki and Morioka. In 1891, the segment between Morioka and Aomori opened, creating the longest continuous railway line in Japan.