There is no through train from Ninghai to Hengdian. You can take the bus from Ninghai to Yiwu at Ninghai main station, get off at Dongyang West Station, and then get off at Dongyang West Station to Hengdian. The fare is probably 75 yuan.

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Before you go, take a look at this, Hengdian Film and Television City Travel Guide, which is also practical.