Kunming Metro, or Kunming Rail Transit, is a rapid transit system in Kunming, the capital of Yunnan Province. With a population of just over 3 million people, Kunming was one of the largest cities in China without a metro system before its construction. The system consist of 14 lines, with 4 lines halfly-finished and in operation, 5 lines under construction and 5 others proposed. The metro consists of subway segments in the city centre and elevated grade-separated segments in the periphery. Line 6 opened on June 28, 2012, connecting the city with its new airport, Kunming Changshui International Airport. South section of line 1 opened on 20 May 2013. The whole first phase of line 1/2 opened on 30 Apr 2014.The Chenggong spur of line 1 came into operation on 26 Dec 2016.Line 3 started operation on 29 Aug 2017.