There is no subway, so you can take the T 132 train. According to Baidu map, there is no subway from Shanghai Station to Changxing Island, so you can travel by train. Take the T 132 train at Shanghai Station and get off at Wafangdian Station, which is the station of Changxing Island. You can take a taxi after you get off the bus. The journey takes about 24 hours and 27 minutes, and you can also take a bus from Shanghai Station to Changxing Island. The whole journey is about 1780.2 km, and it takes about 6580.2 km.