Planning Commission, and received approval in May 1998. The project was renamed the "Shenzhen Metro first phase". In July 1998, SZMC (Shenzhen Metro Group). was formally established. By April 1999, the subway project feasibility study report has been approved by the state. Phase I (1998–2004) Construction of the first sections of Line 1 and Line 4 began in 1999. The grand opening of the Shenzhen Metro system occurred at 5:00 pm on Tuesday, December 28, 2004. This made Shenzhen the seventh city in mainland China to have a subway after Beijing, Tianjin, Shanghai, Guangzhou, Dalian and Wuhan. Initially the trains operated at 15-minute frequencies and consisted of Line 1 services between Luohu and Shijie Zhi Chuang (now Window of the World) and the Line 4 services between Fumin and Shaonian Gong (now Children's Palace). Initially the English names of the stations were rendered in Hanyu Pinyin, but some of the names were changed to English translation with American spelling in mid-2011. The Futian Checkpoint station opened on 28 June 2007 using the name Huanggang. Name changes On April 23, 2008, Shenzhen Municipal Planning Bureau announced that it would change the nomenclature of Shenzhen's subway lines according to the "2007 Urban Rail Transit Plan Scheme". Instead of using numbers as the lines official designation, as typically used in other mainland Chinese metro systems, lines would be given Chinese names more akin to the Hong Kong MTR. In 2010, the Scheme was reviewed and adjusted with new routes and names in addition to newly proposed lines. On 23 October 2013, the SZMC (Shenzhen Metro Group) decided that current operational lines will have their number and names combined, while future lines will only be numbered. Due to the change in the construction order of several lines, some numerical names have been reviewed in order to prevent big jump between numbers. By 2016, only numerical names are used. Lines currently in operation: Lines under construction: Phase II (2007–2011) From 2004 to 2007, there was a lack of official government interest and attention to expanding the subway after completion of Phase 1 with little or no active projects. Subway construction speed was ridiculed as "earthworm speed". On 17 January 2007 Shenzhen won the right to host the 2011 Universiade. In the bid Shenzhen committed to complete of subway lines before the games. The mayor of Shenzhen at the time, Xu Zongheng, sharply criticized the speed