Shanghai Metro is the most developed one of the MTR network, with China's largest and most advanced subway system.

上海地铁是中国最发达的地铁网络之一，有着中国最大、最先进的地铁系统。

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"Because of the new stations on the MTR (the metro), there has been a lot of development in these areas which will eventually push up prices for both rental income and capital value, " he said.

BBC: Living in: Hong Kong

The Copenhagen Metro does not, however, offer the size of the MTA or MTR, operating only two lines over 21km of track with 22 stations.

BBC: Subway systems by the numbers