Qingdao opens Line 11
http://www.metro-report.com/news/metro/single-view/view/qingdao-opens-line-11.html
Recent trend among China's metro is inauguration of suburban rails. It means each metro company can afford to build suburban railways after mitigating traffic jam in downtown area.
Like Japan or Seoul, rapid trains will be needed to offer better service for people living far away from downtown. Rapid train is a sort of train which skips some of the intermediate stations to shorten travel time.