Trains are operated all day, through to Namba.[citation needed]
■Local (各駅停車, Kakueki Teisha) (L)
Operated all day. Mainly shuttles between Nakamozu and Izumi-Chūō (some trains for Komyoike). During the daytime and late at night, some services operate between Izumi-Chūō and Namba.[citation needed]
The section from Nakamozu to Izumigaoka opened on 1 April 1971 as the Semboku Rapid Railway Line (泉北高速鉄道線, Senboku Kōsoku Tetsudō-sen), with 1,067mm (3ft6in) double track and electrification at 600 V DC. The overhead line voltage was increased to 1,500 V DC from 7 October 1973, and the line was extended to Toga-Mikita on 7 December 1973.
The line was extended to Kōmyōike on 20 August 1977, and to Izumi-Chūō on 1 April 1995.
Owing to ongoing financial constraints caused by the COVID-19 pandemic, Semboku Rapid Railway announced that it would be merged into Nankai Railway. The merger took place on 1 April 2025. In addition, the line was renamed to the Semboku Line. Stations were renumbered to NK88 at Fukai through NK92 at Izumi-Chūō.
↑泉北高速12000系が営業運転を開始[Semboku Rapid Railway 12000 series enters revenue service]. Japan Railfan Magazine Online (in Japanese). Japan: Koyusha Co., Ltd. 28 January 2017. Archived from the original on 29 January 2017. Retrieved 29 January 2017.
1234私鉄車両編成表 2016[Private Railway Rolling Stock Formations - 2016] (in Japanese). Japan: Kotsu Shimbunsha. 25 July 2016. p.153. ISBN978-4-330-70116-5.
↑"泉北高速鉄道に16年ぶりの通勤用新型車…南海8300系ベースの「9300系」 2023年夏"[First new commuter train in 16 years, Semboku Rapid Railway announces "9300 series" train based on the 8300 series, scheduled to enter service in summer 2023]. Response Automotive Media (in Japanese). 11 November 2022. Retrieved 11 November 2022.
↑"泉北高速鉄道9300系が営業運転を開始"[Semboku Rapid Railway 9300 series enters revenue service]. Japan Railfan Magazine Online (in Japanese). Japan: Koyusha Co., Ltd. 9 August 2023. Retrieved 1 November 2024.
↑"南海50000系による"泉北ライナー"運転開始"[Nankai 50000 series begins operation on "Semboku Liner"]. Japan Railfan Magazine Online (in Japanese). Japan: Koyusha Co., Ltd. 3 November 2022. Retrieved 9 November 2022.
↑大手私鉄の直営路線に生まれ変わった「南海泉北線」に乗り鉄 南海の名車もご案内します(大阪府堺市、和泉市)【コラム】 | コラム[Take a ride on the Nankai Semboku Line, a newly reborn line operated directly by a major private railway company, and learn about Nankai's famous trains]. Tetsudo Channel (in Japanese). Japan: EXPRESS Co., Ltd. Retrieved 12 June 2025.
↑"南海電鉄,泉北高速鉄道と経営統合へ". Japan Railfan Magazine Online (in Japanese). 20 December 2023. Archived from the original on 20 December 2023. Retrieved 20 December 2023.
↑"「日本一運賃が高い」の噂も返上へ!? 南海「泉北線」誕生の大きな"意味" 長年のライバルに差をつける"[Will the rumour that the fare is the highest in Japan be put to rest? The big "significance" of the birth of Nankai's "Semboku Line" - setting it apart from its long-time rival]. Traffic News (in Japanese). Japan: Mediavague Co., Ltd. 31 March 2025. Retrieved 1 April 2025.
↑"泉北高速鉄道、4月から南海電鉄「泉北線」に - 路線カラーは黄緑色"[Semboku Rapid Railway to become Nankai Electric Railway's "Semboku Line" from April - Line colour will be yellow-green]. Mynavi News (in Japanese). Japan: Mynavi Corporation. 1 November 2024. Retrieved 1 November 2024.