Yuhang. It plans to connect Hangzhou-Deqing Intercity Rail in the future. Line 16 is an express metro line linking Lin'an District with Yuhang District. Line 19 is an express metro line linking Hangzhou West Railway Station, Hangzhou East Railway Station and Hangzhou Xiaoshan International Airport. Hanghai line is a commuter rail line which links Linping District in Hangzhou with Haining in Jiaxing, passing multiple towns as well as the famous China Leather City. The Hangzhou Metro has the only metro system map in China whose first seven lines follow the hue order of the rainbow colors. History Initial plans The planning for a metro system in the city started in the 1990s and was about to start construction works in September 2003, but the State Council suspended construction works due to increasing costs. The state council approved the construction and operation of a rapid transit system by the Hangzhou Subway Group Co. Ltd in Hangzhou on June 5, 2005. The preliminary design for the first line, Line 1, was approved on January 11, 2007, by the Development and Reform Commission after four days of study. It would be long, of which is underground, elevated, and at grade. Construction Construction of the first phase of Hangzhou Metro Line 1 began on March 28, 2007, with subsequent phases beginning later in that year. The first phase included three underground stations in Qianjiang New City. Jiubao East Station is the biggest station along Line 1 and will be a hub for the future metro system and other forms of public transport. The funding of Line 1 came from both the city government and the banks, with 10.2 billion yuan and 5 billion yuan respectively. The first phase construction was estimated to be 45 billion yuan. In January 2009, it was announced that MTR Corporation would invest in a 22 billion-yuan ($3.2 billion) / 25-year / 49% share joint venture with the Hangzhou government to operate Line 1 of the metro. The first section of Line 4 opened for trial operation on February 2, 2015. In December 2016, the National Development and Reform Commission approved the planning for 10 lines, including extensions to the three existing lines, scheduled to open in time for the 2022 Asian Games. By then the Hangzhou Metro network is projected to be long. As of 2018 there are over of subway lines under construction in Hangzhou. Accident On November