— Oyama) begins operation. 26 November 1890: Mito Railway Freight Line (Mito — Nakagawa) begins operation. 1 March 1892: Mito Railway becomes part of the Nippon Railway. 4 November 1895: Nippon Railway Tsuchiura Line (Tsuchiura — Tomobe) begins operation. 1 December 1895: Hatori Station opens. 25 December 1896: Tsuchiura Line (Tabata — Tsuchiura), Sumidagawa Line (Tabata — Sumidagawa) begin operation. 25 February 1897: Iwaki Line (Mito — Taira [present-day Iwaki]) begins operation. 17 May 1897: Tsuchiura Line Kameari Station opens. 29 August 1897: Iwaki Line (Taira — Kunohama) begins operation. 10 November 1897: Iwaki Line (Nakamura [present-day Sōma] — Iwanuma) begins operation. 27 December 1897: Tsuchiura Line Kanamachi Station opens. January 1898: Kitasenju — Sumidagawa connection opens. 1 April 1898: Ishigami Station opens. 3 April 1898: Iwaki Line (Haranomachi — Nakamura) begins operation. 11 May 1898: Iwaki Line (Odaka — Haranomachi) begins operation. 6 August 1898: Tsuchiura Line Mabashi Station opens. 23 August 1898: Iwaki Line (Kunohama — Odaka) begins operation, connecting Tabata and Iwanuma. Tsuchiura Line and Mito Line (Tomobe — Mito) and Iwaki Line are collectively renamed the Kaigan Line. 1 December 1898: Taka Station is renamed Iwaki-Ōta Station. 4 August 1900: Sanuki Station opens. 22 November 1904: Ōno Station opens. 1 April 1905: With the completion of the Mikawashima — Nippori connection, the present-day route is finished. Nippori and Mikawashima Stations open. Service from Ueno to Tabata and back is abolished. 1 November 1906: Nippon Railway is nationalized. 25 March 1909: Tatsuta Station opens. 12 October 1909: Kaigan Line split and renamed: Jōban Line (Nippori — Iwanuma) and Sumidagawa Line (Tabata — Sumidagawa). Jōban Line also handles freight services. 16 February 1910: Minami-Nakagō Station opens. 18 March 1910: Katsuta and Ogitsu Stations open. 1 May 1911: Kita-Kogane Station opens. 5 May 1911: Sumidagawa Line is merged into the Jōban Line. 1 June 1915: Yoshida Station is renamed Hamayoshida Station. 15 March 1921: Yonomori Station opens. 15 August 1922: Nittaki Station opens. 2 February 1925: Kōen-Shimo Station opens, but only operates during the ume blossom-viewing season. 28 October 28, 1925: Nippori — Taira connection finished (joined with northern tracks in 1965). 11 December 1936: Nippori — Matsudo tracks are electrified. 1 October 1939: Shimomago Station is renamed Hitachi-Taga Station. 20 October 1939: Sukegawa Station is renamed Hitachi Station. 15 February 1944: Momouchi signal box is built between Namie and Odaka. 20 February 1944: Suetsugi signal box is built