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The is a rapid transit line in Tokyo, Japan, administered by the Tokyo Metro. Its color on maps is dark green. Stations on the Chiyoda Line carry the letter '''C''' followed by a number. Automatic Train Operation is used on the line between Ayase and Kita Ayase.
The 21.9 km line serves the wards of Adachi, Arakawa, Bunkyō,
Chiyoda, Minato and Shibuya; there is also a short stretch of tunnel in Taitō. A branch line goes from Ayase to Kita-Ayase and is an additional 2.1 km long.
Chiyoda Line trains interoperate with the JR Jōban Line from Ayase Station and with the Odakyū Line from Yoyogi-Uehara. JR through trains are 203 series EMUs specifically designed for the Chiyoda Line.

Contents

Development

Stations

Rolling stock currently used

Development

The Chiyoda Line was originally proposed in 1962 as a line from Setagaya Ward to Matsudo in Chiba Prefecture: its initial development name was 'Line 8'. In 1964, the plan was changed slightly so that through service would be offered on the Jōban Line north of Tokyo, and the line's name was changed to 'Line 9'.
Line 9 was designed to pass through a number of key stations in Chiyoda Ward, one of the main reasons for its final name (which was selected by Teito Rapid Transit Authority employees). It was also intended to relieve the busy Ginza Line and Hibiya Line, which follow a roughly similar route through central Tokyo.
The first stretch of line was opened on December 20, 1969 between Kita-Senju and Ōtemachi. The line was almost completed by October 10, 1972 when it reached Yoyogi-Kōen, although the 1 km section between Yoyogi-Kōen and Yoyogi-Uehara was not completed until March 31, 1978. The branch line to Kita-Ayase was opened on December 20, 1979.
In May 15, 2006, women-only cars were introduced on early-morning trains from Toride on the Jōban Line to Yoyogi-Uehara.
Odakyū currently plans to begin ''Romance Car'' through service to the Chiyoda Line in 2008, which would mark the first time that a Japanese subway system has accommodated reserved-seating trains.

Stations

Station No.	Station	Transfers	Location
C-1	Yoyogi-uehara	Odakyū Odawara Line through trains	Shibuya
C-2	Yoyogi-Kōen
C-3	Meiji-jingūmae	''At Harajuku:'' Yamanote Line
C-4	Omotesandō	Tokyo Metro Ginza Line, Tokyo Metro Hanzōmon Line	Minato
C-5	Nogizaka
C-6	Akasaka
C-7	Kokkai-gijidō-mae	Tokyo Metro Marunouchi Line ''At Tameike-Sannō:''Tokyo Metro Namboku Line, Tokyo Metro Ginza Line	Chiyoda
C-8	Kasumigaseki	Tokyo Metro Hibiya Line, Tokyo Metro Marunouchi Line
C-9	Hibiya	Tokyo Metro Hibiya Line, Toei Mita Line ''At Yūrakuchō:'' Yamanote Line, Keihin-Tōhoku Line, Tokyo Metro Yūrakuchō Line
C-10	Nijūbashimae
C-11	Ōtemachi	Tokyo Metro Hanzōmon Line, Tokyo Metro Marunouchi Line, Toei Mita Line, Tokyo Metro Tōzai Line
C-12	Shin-Ochanomizu	''At Ogawamachi:'' Toei Shinjuku Line ''At Awajichō:'' Tokyo Metro Marunouchi Line ''At :'' Chūō-Sōbu Line, Chūō Rapid Line, Sōbu Main Line
C-13	Yushima		Bunkyō
C-14	Nezu
C-15	Sendagi
C-16	Nishi-Nippori	Yamanote Line, Keihin-Tōhoku Line	Arakawa
C-17	Machiya	Keisei Main Line ''At :'' Toden Arakawa Line
C-18	Kita-Senju	Tokyo Metro Hibiya Line, Jōban Line, Tōbu Isesaki Line, Tsukuba Express	Adachi
C-19	Ayase	Jōban Line through trains

'Kita-ayase Branch Line'

Station No.	Station	Transfers	Location
C-19	Ayase	Jōban Line	Adachi
C-20	Kita-Ayase

Rolling stock currently used

★ 'Tōkyō Metro stock:'

★
★ Tokyo Metro 06 series 10-car trains x 1 (since 1993)

★
★ Tokyo Metro 5000 series 3-car trains x 2 (since 1969, currently used on branchline only)

★
★ Tokyo Metro 6000 series 10-car trains x 35 (since 1971)

★
★ 6000 series 3-car trains x 1 (since 1968, currently used on branchline only)

★ 'Inter-running stock:'

★
★ Odakyū 1000 series 10-car trains

★
★ Odakyū 4000 series 10-car trains (from September 2007)[1]

★
★ Odakyū 60000 series MSE (from spring 2008)[2]

★
★ JR East 203 series 10-car trains

★
★ JR East 207-900 series 10-car trains

★
★ JR East 209-1000 series 10-car trains

★
★ JR East E233 series 10-car trains x 18 (from summer 2008)[3]