Songshan–Xindian Line or Green Line (G as identifier) is a line of Taipei Metro. Parts of the line runs under the Roosevelt Road, following the route of the former TRA Xindian Line—which ceased service in 1965— on its southern section.
- January 1991: Construction began on the Xindian Line.
- November 21, 1997: The Songshan-Ximen section is approved by the Executive Yuan.
- December 24, 1998: The segment from Chiang Kai-shek Memorial Hall-Guting opened for service.
- November 11, 1999: The rest of the line opened for service, trains run through Tamsui Line to Tamsui Station.
- August 31, 2000: The segment from Chiang Kai-shek Memorial Hall-Ximen opened for service (as the Xiaonanmen Line).
- September 29, 2004: The Xiaobitan Branch Line opened for service.
- August 19, 2006: Construction begins on the Songshan-Ximen section.
- December 2008: During underground excavation along Nanjing East Road, Section 3, underground support (anchors) for several nearby buildings were discovered. Structural concerns resulted in a temporary suspension of excavation and construction.
- January 14, 2009: The city government announced that the building anchors would not affect the opening of the Songshan-Ximen section.
- November 15, 2014: With the opening of Songshan Line, trains run between Songshan and Xindian Stations, forming Green Line. Tamsui-Xindian services ended.
Tianshui Road Station
Initial plans for the line originally called for another station between Zhongshan and Beimen stations (at Chien-Cheng Circle). However, the Circle was suffering from economic concerns, as well as engineering feasibility and effectiveness problems. Coupled with problems with landowners regarding joint developments and two of the entrances/exits, plans for the station were shelved on May 1, 2007. The station would have been a five-level underground station with stacked, split platforms.
Line construction (Songshan section)
It was originally estimated that its opening will take place in 2013.
Shield tunneling was used to construct most of the tunnels on the line, except for a few locations. Tunneling beneath Dacheng St. crosses existing Taiwan Railway Administration and Taiwan High Speed Rail tunnels. Common utility ducts were constructed in sync with the Metro line, carrying water pipes, gas pipes, and cables. Over 200 homes were demolished or relocated to make way for Metro land use.
Construction of the line was divided into three civil engineering section contracts and one electrical/mechanical system-wide contract. The contract for construction on the eastern end of the line (including Nanjing Sanmin and Songshan) was awarded to Da Cin Construction Co., Ltd. on March 2, 2006. The 3.02 km (1.88 mi)-long section includes a crossover section, a tail-track work shaft, and three shield tunnels. Construction of the line was completed in late 2014.
In 2008, steel price increases threatened to delay construction plans due to the price doubling over the previous two years. The Ministry of Economic Affairs ordered that exports of other steel products be strictly supervised to ensure a steady local supply and to keep prices down.
Taipei Workshop, a 3rd level historical monument constructed during the era of Japanese rule, was exactly where the proposed Beimen Station would be located. Thus, a temporary removal project commenced on October 20, 2006 to move the structure until construction of both the Songshan Line and the Taoyuan International Airport MRT are completed. The building moved 30 meters to the southeast, and moved back when construction is completed.
Over the years, three kinds of rolling stock were used on this line, as well as on the through services between Xindian and Tamsui. The first fleet of trains were the C301 cars. In 1997, C321 cars were added to the fleet. In 2007, a fleet of C371 cars replaced all C321 cars. (C321 cars continue services on Bannan Line.)
- Green Line service routes are divided into:
- Xiaobitan Branch Section:
|●||●||G19||Songshan||松山||West Coast (098)||Songshan||Taipei|
|300 m: Taoyuan Airport MRT (A1 Taipei Main)||Datong|
|●||●||G10||Chiang Kai-shek Memorial Hall|
(National Taiwan University)
(Xindian Senior High School)
|●||G02||Xindian District Office||新店區公所|