Try Beijing.
From The Guardian:
Each day 9.75 million passengers ride the lines across Beijing: nearly three times as many as take the London Tube and twice as many as use the New York system. The subway’s phenomenal expansion reflects that of the city it serves.
Over the last decade or so, Beijing has grown by roughly half a million inhabitants each year – the equivalent of adding the entire populations of Sheffield or Tucson annually. The city is already home to 21 million; by 2020, a report warned last year, it is likely to have added another four million, on a conservative estimate. …
In the next six and a half years, extensions to the Beijing subway will cover more ground than the entire London Underground network has in a century and a half.
Full article here.
