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Seibu Kokubunji Line
A 2000 series train on the Kokubunji Line in April 2021
Overview
Native name	西武国分寺線
Owner	Seibu
Locale	Kanto region
Termini	Kokubunji Higashi-Murayama
Stations	5
Service
Type	Commuter rail
System	Seibu Shinjuku
Services	1
Rolling stock	Seibu 2000 series
History
Opened	21 December 1894; 130 years ago (1894-12-21)
Technical
Line length	7.8 km (4.8 mi)
Number of tracks	1 (1.2 km double-tracked)
Track gauge	1,067 mm (3 ft 6 in)
Electrification	1,500 V DC (overhead catenary)
Operating speed	85 km/h (53 mph)
Highest elevation	300 m (980 ft)

v t e Seibu Kokubunji Line
Legend
JR Chūō line 0.0 Kokubunji Tamako Line 0.9 Hanesawa Musashino Line 2.1 Koigakubo Tamagawa Aqueduct 3.6 Takanodai Haijima Line 5.1 Ogawa Haijima Line Tamako Line Shinjuku Line 7.8 Higashi-Murayama Seibuen Line Seibuen Shinjuku Line Hon-Kawagoe

The Seibu Kokubunji Line (西武国分寺線, Seibu Kokubunji-sen) is a railway line in Tokyo, Japan, operated by the private railway operator Seibu Railway.

The line is part of the Seibu Shinjuku group of railway lines and connects suburban areas of western Tokyo to Seibu and JR main lines that run to central Tokyo. The line passes through the cities of Higashimurayama, Kodaira, and Kokubunji.

The line was opened in 1894 as part of the Kawagoe Railway linking Kokubunji and Hon-Kawagoe. At this time, Ogawa was the only intermediate station on the Higashi-Murayama to Kokubunji section. In 1927, the Kawagoe railway was diverted at Higashi-Murayama to a new section of track to Takadanobaba and so the Kokubunji line was formed from the orphaned section. The line was electrified in 1948. Two additional intermediate stations were later opened between Ogawa and Kokubunji: Takanodai opened in 1948, and Koigakubo opened in 1955. Setting up of Hanesawa and track doubling from Koigakubo to Hanesawa was carried out in 1968. Since July 2008, recorded announcements on trains have been provided in English in addition to Japanese.

Through service onto the Seibu Shinjuku Line has been suspended since 19 March 2019 because of the reconstruction of Higashi-Murayama Station into an elevated station.^[1]

No.	Station		Distance (km)	Connections	Location
SK01	Kokubunji	国分寺	0.0	Seibu Tamako Line JC Chuo Line (Rapid)	Kokubunji	Tokyo
SK02	Koigakubo	恋ヶ窪	2.1
SK03	Takanodai	鷹の台	3.6		Kodaira
SK04	Ogawa	小川	5.1	Seibu Haijima Line
SK05	Higashi-Murayama	東村山	7.8	Seibu Shinjuku Line, Seibuen Line	Higashimurayama

2000 series EMUs are used on this line. These trains are painted in Seibu Railway's distinctive yellow livery. All trains are local services and stop at all stations. Trains take 12 minutes to complete the 7.8 km (4.8 mi) journey.^[2] The line is mostly single track between Higashi-Murayama and Koigakubo, but with double track sections at each station. Track between Koigakubo and Kokubunji is double track for the first 1.2 km (0.75 mi) and single track the last 0.9 km (0.6 mi) before Kokubunji station. The track changes from double to single at Hanesawa (羽根沢信号場, Hanesawa shingōjō).^[3] The 1.2 km (0.75 mi) double-track section allows 8 trains per hour to operate in each direction during peak. At Kokubunji Station, trains use only a single platform (platform 5) at the terminus.^[4]

Wikimedia Commons has media related to Seibu Kokubunji Line.

• Seibu Railway route map - Kokubunji Line
• see middle Shinjuku Line section - Kokubunji Line (in Japanese)