The 13.8km phase 3 extension of Line 9 runs east from Yanggaozhong Road via Jinhai Road where it interchanges with Line 12 to Caolu and has nine underground stations.\r\nLine 17 is a 34.7km partly elevated, partly underground line serving the western area of Shanghai and has 13 stations of which seven are underground. It runs from Hongqiao high-speed station, where it connects with lines 2 and 10, via Dianshan Avenue to Oriental Land. Trains will operate at five-minute intervals between Hongqiao and Dianshan Avenue during peak periods reducing to eight-minute intervals to Oriental Land.\r\nShanghai Metro says Line 17 is the first on the network to use a domestic automatic train operation with fully automatic driving functions and automatic door opening and closing. The trains have a self-diagnostic system to detect faults which should improve operating efficiency and reduce maintenance costs.\r\nThe Line 17 trains also have an inverter air-conditioning system to improve temperature control and LED lighting. The area for disabled passengers in wheelchairs is equipped with seat belts.