The Shanghai Metro has quite a bit of elevated track (including an interesting stretch of the north end of Line 1 that runs underneath an elevated highway) but the only elevated line that could be said to be in the city centre is Line 3, and even then it just runs around the periphery of Shanghai's densest districts.
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"Nothing is too wonderful to be true, if it be consistent with the laws of nature." - Michael Faraday (1791-1867)
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