The Tainan Urban District Railway Underground Project was approved by the Executive Yuan on September 9, 2009 as part of the TRA Rapid Transit Systematization in the Metropolitan Areas Project. The project is designed to meet urban renewal needs in the Tainan Station area, integrate city transportation systems, and provide a more convenient and modern transportation system. The project duration starts from September, 2009 to November 2026 and the total cost is NT$33.67 billion.
The Tainan Project involves the construction of an 8.23-kilometer-long underground rail line from the south end of the Zhonghua Land Bridge (Yongkang Bridge) to the south end of Shengchan Road. The old Tainan Station building was preserved as a historic site. The new Tainan Station was established along with two new commuter stations—Linsen and South Tainan. The project eliminates nine railway crossings and four underpasses.