Tanimachi Line

The is a rapid transit line of Osaka Metro, running from Dainichi Station in Moriguchi to Yaominami Station in Yao through Osaka. Its official name is , while the Osaka Municipal Transportation Bureau refers to it as , and in MLIT publications, it is written as . On line maps, stations on the Tanimachi Line are indicated with the letter T.

The central part of the line runs underneath Tanimachi-suji, a broad north–south thoroughfare lined with prefectural government buildings and Buddhist temples. Its only above-ground segment is the vicinity of Yaominami Station. The line color on maps, station signs and train livery is , derived from the '' kasaya'' robes worn by Buddhist monks.

Overview

As noted above, the Tanimachi Line is officially "Line No. 2", but it was actually the fourth to open, after Line No. 3 (the Yotsubashi Line) during World War II and Line No. 4 (the Chūō Line) in the early 1960s. The line was opened gradually from the late 1960s to the early 1980s.

Ridership, though less than half the numbers of the Midōsuji Line, is still the second-highest of all lines in the Osaka subway network, thanks to the large number of government buildings in eastern Chūō-ku and schools around Tennōji (total ridership for fiscal year 2009 was approximately 480,000 per day). It is also the second-most profitable subway line in Osaka (total profit for FY 2009 was ¥7.3 billion — a 9.4% increase over the previous year).

The Tanimachi Line has the longest operating distance (for the purpose of fare calculation) in the Osaka subway network, after the Midōsuji Line (although the latter would be the longest in the Osaka subway network if the Kita-Osaka Kyūkō Railway section of the Midōsuji Line was taken into account). It runs completely underground from Dainichi to just before Yaominami, and was known as the longest continuously underground subway line in Japan for a long time after the opening of Yaominami Station (it was also among the longest subway tunnels in the world at the time of its opening).The 1979 to 1981 Japanese editions of the Guinness Book of World Records (published by Kodansha) listed as the "World's Longest Subway Tunnel" Morden – East Finchley via Bank (27.8km) on the Northern line of the London Underground, while the 1982 edition honored Belyayevo – Medvedkovo (30.km, opened 1978) on the Kaluzhsko-Rizhskaya Line of the Moscow Metro. Now, it is fourth in Japan after the Toei Ōedo Line (entire line, ), Saitama Rapid Railway Line/Tokyo Metro Namboku Line/ Tōkyū Meguro Line ( – via and , ), and Nagoya Municipal Subway Meijō Line/ Meikō Line (entire line, ).

If one considers , , and stations as the same station (as they are for the purpose of transfers within 30 minutes), the Tanimachi Line has connections to all other subway lines in Osaka. (By comparison, the Chūō Line is the only subway line in Osaka that connects to all other subway lines, as well as the Nankō Port Town Line.)

Line data

* Above-ground section: vicinity of Yaominami
* Blocking system: Automatic
* Train protection system: WS-ATC
* Cars per train: 6 (1976–present)
* Maximum possible cars per train (platform length): 8

For the purposes of fare calculation, the Higashi-Umeda–Tennōji segment is adjusted to the same length as Umeda–Tennōji on the Midōsuji Line.

Stations

Stopping patterns

All trains stop at every station along their route. During the day, trains alternate between Dainichi and Yaominami, and between Miyakojima and Fuminosato, with additional trains starting or terminating at Kire-Uriwari during rush hour. As the line is quite long and goes through the center of Osaka, express service was planned, but never implemented.

Since 1976, all trains have had 6 cars. Platforms are long enough to accommodate 8-car trainsets; the unused portions are fenced.

Women-only cars

Women-only cars were introduced on the line from 15 December 2003. There is one such designated car in each train (Car No. 3), the use of which is restricted on weekdays from the first train until 9 a.m. The women-only restriction is lifted after 9 a.m.

Rolling stock

* 22 series 6-car EMUs (since 1990)
* 30000 series 6-car EMUs (since 2009)

Train maintenance and inspection is carried out by the same group in charge of Chūō Line trains, at the Morinomiya depot and workshop, accessible through a spur located before Tanimachi Rokuchōme Station on the Tanimachi Line and after Tanimachi Yonchōme Station on the Chūō Line (the Dainichi and Yao depots are used mainly to store off-service trains). In 2006, in preparation for the opening of the Kintetsu Keihanna Line extension of the Chūō Line (then known as the Higashi-Osaka Line), nine 20-series trainsets of the Tanimachi Line were exchanged for nine 22-series trainsets (converted from 24-series trains) from the Chūō Line.

File:Osaka Subway Series New 20 002 JPN.jpg, 22 series trainset (Tanimachi Line 22–50 series)
File:Osaka Subway 32601F 20090918.jpg, 30000 series trainset

Former

* 50 series (1969–1991)
** 5700 series (1980–1991)
** 5800 series (1978–1991)
** 5900 series (1978–1991)
* 10 series (1974–1976) (subsequently transferred to the Midōsuji Line)
* 20 series (1989–2006) (transferred to the Chūō Line)
* 30 series (1967–2013)

File:Osaka subway 30 series 3045 20060310.jpg, 30 series trainset

History

Construction

According to the original plan laid out for the Tanimachi Line in 1927, it was to follow Matsuyamachi-suji (to the west of Tanimachi-suji). It was also intended to interface directly with the Midōsuji Line directly at Umeda, similar to the cross-platform interchange between the Yotsubashi Line and the Midōsuji Line at . A second tunnel was dug at Umeda for this purpose, but the connection southwards was plagued by collapses and other accidents; as a result, the planned route was changed to the current one, stopping at Higashi-Umeda and then veering eastward. The tunnel at Umeda reserved for the Tanimachi Line ("Matsuyamachi Line") went unused for decades before finally being adapted for the southbound track of the Midōsuji Line in 1989, allowing for expanded platforms to cope with overcrowding.

Over the course of tunnel construction for the line, the underground waterways in Osaka were greatly altered, causing a number of incidents in which famous wells dried up.

In 1970, during the construction of the underground Tenjimbashi Rokuchōme Station, there was a large gas explosion which caused a number of workers' deaths. This became known as the " Ten-Roku Gas Explosion Accident" in Japan.

Successor to the Nankai Hirano Line

Compared to the majority of areas served by the subway, where it runs underneath major roadways with high levels of traffic, part of the Tanimachi Line runs underneath relatively narrow streets with fewer cars, near