Osaka Metro Chūō Line

The is a rapid transit system in Osaka, Japan, operated by Osaka Metro. The line runs east-westerly under . Its official name is , and in MLIT publications, it is written as . Station numbers are indicated by the letter C.

Together with the through operation to the Keihanna Line, the three lines have a unified nickname .

On 1 July 2005, Osaka City bought the from Cosmosquare to Osakakō of its subsidiary , reducing fare to increase traffic. The section operationally became a part of the Chūō Line, but is however still owned by OTS.

The Chūō Line is the only line to connect to all other subway lines operated by the Osaka Metro, including the Nankō Port Town Line.

History

The line (initially known as Line No. 4) opened on 11 December 1961, initially running between Ōsakakō and Bentenchō (this was the first elevated portion of the Osaka subway system); trains were initially composed of single-car trainsets, with occasional use of three-car trainsets during trade fairs held near Asashiobashi. Between 1964 and 1985, the line was expanded towards Nagata in four stages:

• 31 October 1964: Section between Bentenchō and Hommachi opens, with intermediate stations at Kujo and Awaza.
• 30 September 1967: The section between Tanimachi 4-chome and Morinomiya opens as a shuttle service with 2-car trains.
• 29 July 1968: The section of the shuttle service between Morinomiya and Fukaebashi opens.
• 6 December 1969: The section between Hommachi and Tanimachi 4-chome (including Sakaisuji-Hommachi) opens after construction delays; the shuttle service between Tanimachi 4-chome and Fukaebashi was absorbed into the line, which was now named the Chūō Line. 4-car trains begin operation.
• 5 April 1985: The section between Fukaebashi and Nagata opens. 6-car trains begin operation.
• 1 October 1986: Through service to Ikoma commences upon the opening of the Kintetsu Keihanna Line (then named the Higashiosaka Line).

On 18 December 1997, the OTS Technoport Line opened between Ōsakakō and Cosmosquare. This line was absorbed into the Chūō Line on 1 July 2005. The Keihanna Line was extended further into Nara when the extension to Gakken Nara-Tomigaoka opened on 27 March 2006. On 19 January 2025, the first phase of the OTS Hokkō Technoport Line opened to Yumeshima Station in preparation for Expo 2025 to be held on the artificial island of Yumeshima.

Future plans

The Template:Ill is a planned extension of the Chūō Line from Cosmosquare on Template:Ill to Yumeshima, Maishima Sports Island and Template:Ill. Phase 1, consisting of a one-stop extension to Yumeshima Station, opened on 19 January 2025, ahead of the opening of the Osaka 2025 Expo.

Separately, a new station is planned to be built on the spur track to the Morinomiya depot facility as part of local revitalization efforts and also to serve the new Morinomiya campus of Osaka Metropolitan University, with a projected completion date of 2028.

Line data

• Above-ground section: west of Ōsakakō to west of Awaza; east of Aramoto (Keihanna Line)
• Block signalling: Automatic
• Train protection system: WS-ATC
• Cars per train: 6 (1984 – present)
• Maximum possible cars per train (platform length): 8

Stations

No.	Station	Japanese	Distance (km)	Transfers	Location
Template:OMSN	Template:STN		0.0		Konohana-ku, Osaka
Template:OMSN	Template:STN		3.2	Template:Ric (P09)	Suminoe-ku, Osaka
Template:OMSN	Template:STN (Tempozan)		5.6		Minato-ku, Osaka
Template:OMSN	Template:STN		7.1
Template:OMSN	Template:STN		8.7	Template:Rcb Template:Lnl
Template:OMSN	Template:STN		10.0	File:Number prefix Hanshin line.svg Hanshin Namba Line	Nishi-ku, Osaka
Template:OMSN	Template:STN		11.5	Template:Ric (S13)
Template:OMSN	Template:STN (Semba-nishi)		12.6	Template:Plainlist	Chūō-ku, Osaka
Template:OMSN	Template:STN (Semba-higashi)		13.3	Template:Ric (K15)
Template:OMSN	Template:STN		14.3	Template:Ric (T23)
Template:OMSN	Template:STN		15.6	Template:Plainlist
Template:OMSN	Template:STN		16.8	Template:Ric (I20)	Higashinari-ku, Osaka
Template:OMSN	Template:STN		17.9
Template:OMSN	Template:STN		19.3	Template:Rcb Template:Lnl	Higashiosaka
Template:OMSN	Template:STN		21.1	Template:Rcb Template:Lnl
↓ Through services to/from Gakken Nara-Tomigaoka Station via the Template:Rcb Keihanna Line ↓

Rolling stock

File:Morinomiya subway.jpg

Morinomiya Depot in May 2015.

Osaka Metro

• 24 series (from 1991)
• 30000A series (from July 2022)
• 400 series (from 25 June 2023)

Kintetsu Railway

• 7000 series (from 1986)
• 7020 series (from 2004)

All rolling stock have a maximum service speed limit of Template:Convert, which is achievable on the Yumeshima–Ōsakakō section as well as on the Keihanna Line, while the Ōsakakō–Nagata section has the standard subway speed limit of Template:Convert. In addition, all rolling stock are equipped with retarders to negotiate the continuous gradients of the Ikoma Tunnel of the Keihanna Line.

The Osaka Metro rolling stock are stored at Morinomiya Depot, while the Kintetsu Railway rolling stock are based at Higashi-Hanazono and Tomigaoka Depots located on the Keihanna Line. Since 2016, after heavier repairs and maintenance of all third-rail-powered Osaka Metro rolling stock have been consolidated at Midorigi Depot on the Yotsubashi Line, Chūō Line rolling stock owned by Osaka Metro are also able to access said depot via a newly-built spur track located before Hommachi Station.

• 24 series
  24 series
• 30000A series
  30000A series
• 400 series
  400 series
• Kintetsu 7000/7020 series
  Kintetsu 7000/7020 series

Former

• 800 series (1961–1978)
• 900 series (1964–1978)
• 30 series (1967–1969, 1983–1995)
• 50 series (1969–1991)
• 20 series (1984–2024)