Wenhu line

 ( Taipei Metro Lines ) 

One of the largest suppliers for the system, Matra, which supplied the VAL 256 rolling stock and electrical systems for the line sued the Department of Rapid Transit Systems of the Taipei City Government for costs overruns claiming to have resulted from the latter failing to provide the necessary infrastructure to build the line. High Court orders compensation in fight over MRT line, Joy Su, Taipei Times, 9 April 2004, p. 1 Subsequently, the company pulled out of the operation of the line in 1994. Chen Shui Bian, then Mayor of Taipei declared that progress and operation of the line would continue despite the walkout in the now-popular catchphrase "馬特拉不拉，我們自己拉" ( lit: If Matra doesn't pull, we'd pull it ourselves). After a 12-year-long legal tussle, in 2005, Matra was awarded NT$1.6 billion (approx. US$50 million) in damages by the Supreme Court of the Republic of China. Matra wins final appeal against city government, Rich Chang, 24 July 2005, Taipei Times, p. 1 木柵捷運馬特拉案　北市府認賠20億　每位市民賠790元 , ETTV News, 17 August 2005

Services on the Wenshan line began with two-car operation of the VAL 256 coupled together. Eventually, increasing patronage on the system led to operation in four-car configurations. The opening of Maokong Gondola in 2007 have also boosted passenger numbers travelling on the line to Taipei Zoo for transfer.

The Wenshan line is connected to the Neihu Line, which opened in July 2009. It connects to Neihu and Taipei Songshan Airport, which currently has no rapid transit access. Since an alternative contractor Bombardier was awarded to supply the rolling stock and the signaling system for the new line, the Wenshan line's signaling system was converted to suit the new communications-based train control (CBTC) CITYFLO 650 to allow both the old Matra rolling stock and the new Bombardier rolling stock to run in co-existence. On 19 December 2010, fifty-one pairs of retrofitted VAL 256's (from the Matra rolling stock) will begin testing on the entire line. After over half a year of testing, the additional trains will decrease the time between trains at rush hour from 2 minutes to 72 seconds and bring the total number of trains operating on the line to 152 pairs.

The long-awaited Neihu line has had many delays prior to its opening. Since the Neihu line was planned as an extension to the Wenshan line, the original plan called for a similar elevated medium-capacity line. However, due to the growth of the Neihu District, many residents and politicians called for an underground, high-capacity line instead (similar to the Bannan line).

The initial cost estimate of the elevated line was NT$42.6 billion, but due to delays the price-adjusted cost estimate rose to over NT$60.3 billion. A shift to underground construction would have increased the cost to as high as NT$134.4 billion. However, the Central Government stated that if construction for the Neihu line did not start immediately, they would withhold the grant money for the line. In addition, due to the narrow streets and numerous turns in Neihu, construction of an underground high-capacity line would have been infeasible. Thus, the plan to build an elevated line continued after much delay.

There was also significant debate whether should be included on the route. The addition of the station added an additional to the line's length. Because of the inclusion of the station, the final cost of the line reached NT$66.7 billion.

The line was initially planned to begin service in 1996, and after 13 years of delay, the line finally began operations. However, the Neihu line has been criticised for its frequent malfunctions and safety issues.

• 23 February 1987: Initial planning of the Neihu line started.
• 15 December 1988: Construction of the Wenshan line begins. At this time, the Neihu line is planned to open in 1996.
• 28 September 1993: Because of fires on the trains during trials of the Wenshan line, all Neihu line planning was halted.
• 9 October 1993: The Department of Rapid Transit Systems (DORTS) announced plans to change the Neihu line to a high-capacity underground line.
• 23 August 1994: The DORTS announced plans to continue building the Neihu line as a medium-capacity elevated line. Neihu residents protest the change.
• 26 September 2001: All 12 stations on the Neihu line are finalised.
• 23 May 2002: Construction begins on the Neihu line.
• 24 December 2007: The first trial run is conducted between and .
• 28 June 2008: Construction of the Neihu line is completed.
• 4 July 2009: The Wenshan line is converted to the new CITYFLO 650 system from the 13-year-old Matra fixed block system. Service on the Neihu line begins.
• 10 July 2009: Because of system problems, service on the Brown line was halted at 15:30 until 18:30 the next day.
• 19 December 2010: Retrofitted VAL 256 cars begin testing on the Brown line. It is expected to decrease waits between trains and increase line capacity.

With the opening of the Neihu line, the entire line switched over to the new automatic train control CITYFLO 650 using INNOVIA APM 256 trains (produced by Bombardier, internally code-named C370 by the TRTC). As of 19 December 2010, trials are being run on retrofitted VAL 256 trains modified to run on both the Muzha and Neihu lines. The trains are expected to fully enter revenue service after testing by 26 December 2010. On 26 December 2010, the line would operate with 6 pairs of the retrofitted VAL 256's and 25-29 pairs of the C370's. By 27 December, the ratio increased with 10 pairs of VAL 256's and 40 pairs of the C370's.

The Wenhu line is now the only line worldwide to use the VAL 256; the O'Hare International Airport's Airport Transit System phased theirs out in 2019.